myArray."
]
},
{
"id": "cf1111c1c11feddfaeb8bdef",
"title": "Modify Array Data With Indexes",
"description": [
"We can also modify the data stored in arrays by using indexes.",
"For example:",
"var ourArray = [3,2,1];",
"ourArray[0] = 1; // equals [1,2,1]",
"Now modify the data stored at index 0 of myArray to the value of 3."
],
"tests": [
"assert((function(){if(typeof myArray != 'undefined' && myArray[0] == 3 && myArray[1] == 2 && myArray[2] == 3){return true;}else{return false;}})(), 'message: myArray should now be [3,2,3].');",
"assert((function(){if(editor.getValue().match(/myArray\\[0\\]\\s?=\\s?/g)){return true;}else{return false;}})(), 'message: You should be using correct index to modify the value in myArray.');"
],
"challengeSeed": [
"var ourArray = [1,2,3];",
"",
"ourArray[1] = 3; // ourArray now equals [1,3,3].",
"",
"var myArray = [1,2,3];",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"if(typeof myArray !== \"undefined\"){(function(){return myArray;})();}"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Modifica datos de un vector usando índices",
"descriptionEs": [
"También podemos modificar los datos almacenados en vectores usando índices.",
"Por ejemplo:",
"var ourArray = [3,2,1];",
"ourArray[0] = 1; // equals [1,2,1]",
"Ahora establece el dato almacenado en el índice 0 de myArray para que sea el valor 3."
]
},
{
"id": "bg9994c9c69feddfaeb9bdef",
"title": "Manipulate Arrays With pop()",
"description": [
"Another way to change the data in an array is with the .pop() function.",
".pop() is used to \"pop\" a value off of the end of an array. We can store this \"popped off\" variable by performing pop() within a variable declaration.",
"Any type of data structure can be \"popped\" off of an array - numbers, strings, even nested arrays.",
"Use the .pop() function to remove the last item from myArray, assigning the \"popped off\" value to removedFromMyArray."
],
"tests": [
"assert((function(d){if(d[0] == 'John' && d[1] == 23 && d[2] == undefined){return true;}else{return false;}})(myArray), 'message: myArray should only contain [\"John\", 23].');",
"assert((function(d){if(d[0] == 'cat' && d[1] == 2 && d[2] == undefined){return true;}else{return false;}})(removedFromMyArray), 'message: removedFromMyArray should only contain [\"cat\", 2].');"
],
"challengeSeed": [
"var ourArray = [1,2,3];",
"",
"var removedFromOurArray = ourArray.pop(); // removedFromOurArray now equals 3, and ourArray now equals [1,2]",
"",
"var myArray = [\"John\", 23, [\"cat\", 2]];",
"",
"// Only change code below this line.",
"",
"var removedFromMyArray;",
"",
"// Only change code above this line.",
"",
"(function(y, z){return 'myArray = ' + JSON.stringify(y) + ' & removedFromMyArray = ' + JSON.stringify(z);})(myArray, removedFromMyArray);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Manipula vectores con pop()",
"descriptionEs": [
"Otra forma de cambiar los datos en un vector es con la función .pop().",
".pop() se utiliza para \"sacar\" el valor final de un vector. Podemos almacenar el valor \"sacado\" asignando pop a una variable por ejemplo durante su declaración.",
"Todo tipo de datos puede ser \"sacado\" de un vector --números, cadenas, incluso los vectores anidadas.",
"Usa la función .pop() para sacar el último elemento de myArray y asigna ese valor \"sacado\" a removedFromMyArray ."
]
},
{
"id": "bg9995c9c69feddfaeb9bdef",
"title": "Manipulate Arrays With push()",
"description": [
"Not only can you pop() data off of the end of an array, you can also push() data onto the end of an array.",
"Push [\"dog\", 3] onto the end of the myArray variable."
],
"tests": [
"assert((function(d){if(d[2] != undefined && d[0] == 'John' && d[1] == 23 && d[2][0] == 'dog' && d[2][1] == 3 && d[2].length == 2){return true;}else{return false;}})(myArray), 'message: myArray should now equal [\"John\", 23, [\"dog\", 3]].');"
],
"challengeSeed": [
"var ourArray = [\"Stimpson\", \"J\", [\"cat\"]];",
"",
"ourArray.pop(); // ourArray now equals [\"Stimpson\", \"J\"]",
"",
"ourArray.push([\"happy\", \"joy\"]); // ourArray now equals [\"Stimpson\", \"J\", [\"happy\", \"joy\"]]",
"",
"var myArray = [\"John\", 23, [\"cat\", 2]];",
"",
"myArray.pop();",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"(function(z){return 'myArray = ' + JSON.stringify(z);})(myArray);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Manipula vectores con push()",
"descriptionEs": [
"No sólo se pueden sacar datos del final de un vector con pop(), también puedes empujar (push()) datos al final del vector.",
"Empuja [\"dog\", 3] al final de la variable myArray."
]
},
{
"id": "bg9996c9c69feddfaeb9bdef",
"title": "Manipulate Arrays With shift()",
"description": [
"pop() always removes the last element of an array. What if you want to remove the first?",
"That's where .shift() comes in. It works just like .pop(), except it removes the first element instead of the last.",
"Use the .shift() function to remove the first item from myArray, assigning the \"shifted off\" value to removedFromMyArray."
],
"tests": [
"assert((function(d){if(d[0] == 23 && d[1][0] == 'dog' && d[1][1] == 3 && d[2] == undefined){return true;}else{return false;}})(myArray), 'message: myArray should now equal [23, [\"dog\", 3]].');",
"assert((function(d){if(d === 'John' && typeof removedFromMyArray === 'string'){return true;}else{return false;}})(removedFromMyArray), 'message: removedFromMyArray should contain \"John\".');"
],
"challengeSeed": [
"var ourArray = [\"Stimpson\", \"J\", [\"cat\"]];",
"",
"var removedFromOurArray = ourArray.shift(); // removedFromOurArray now equals \"Stimpson\" and ourArray now equals [\"J\", [\"cat\"]].",
"",
"var myArray = [\"John\", 23, [\"dog\", 3]];",
"",
"// Only change code below this line.",
"",
"var removedFromMyArray;"
],
"tail":[
"(function(y, z){return 'myArray = ' + JSON.stringify(y) + ' & removedFromMyArray = ' + JSON.stringify(z);})(myArray, removedFromMyArray);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Manipula vectores con shift()",
"descriptionEs": [
"pop() siempre elimina el último elemento de un vector. ¿Qué pasa si quieres quitar el primero?",
"Ahí es donde entra .shift(). Funciona igual que .pop (), excepto que elimina el primer elemento en lugar del pasado. ",
"Usa la función .shift() para eliminar el primer elemento de myArray, y el elemento que saques asignalo a removedFromMyArra"
]
},
{
"id": "bg9997c9c69feddfaeb9bdef",
"title": "Manipulate Arrays With unshift()",
"description": [
"Not only can you shift elements off of the beginning of an array, you can also unshift elements onto the beginning of an array.",
"unshift() works exactly like push(), but instead of adding the element at the end of the array, unshift() adds the element at the beginning of the array.",
"Add \"Paul\" onto the beginning of the myArray variable using unshift()."
],
"tests": [
"assert((function(d){if(typeof d[0] === \"string\" && d[0].toLowerCase() == 'paul' && d[1] == 23 && d[2][0] != undefined && d[2][0] == 'dog' && d[2][1] != undefined && d[2][1] == 3){return true;}else{return false;}})(myArray), 'message: myArray should now have [\"Paul\", 23, [\"dog\", 3]]).');"
],
"challengeSeed": [
"var ourArray = [\"Stimpson\", \"J\", [\"cat\"]];",
"",
"ourArray.shift(); // ourArray now equals [\"J\", [\"cat\"]]",
"",
"ourArray.unshift(\"happy\"); // ourArray now equals [\"happy\", \"J\", [\"cat\"]]",
"",
"var myArray = [\"John\", 23, [\"dog\", 3]];",
"",
"myArray.shift();",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"(function(y, z){return 'myArray = ' + JSON.stringify(y);})(myArray);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Manipula vectores con unshift()",
"descriptionEs": [
"No sólo se puedes correr (shift) elementos del comienzo de un vector, también puedes descorrerlos (unshift) al comienzo.",
"unshift() funciona exactamente igual que push(), pero en lugar de añadir el elemento al final del vector, unshift() añade el elemento al comienzo del vector. ",
"Añade \"Paul\" al comienzo de la variable myArray usando unshift()."
]
},
{
"id": "bg9997c9c89feddfaeb9bdef",
"title": "Write Reusable JavaScript with Functions",
"description": [
"In JavaScript, we can divide up our code into reusable parts called functions.",
"Here's an example of a function:",
"function functionName(a, b) {",
" return a + b;",
"}",
"After writing the above lines in our code, we can then pass values to our function and the result following the return statement will be returned.",
"For example, we can pass numbers 4 and 2 by “calling” the function later in our code like this: functionName(4, 2).",
"In this example, the function will return the number 6 as this is the result of 4 + 2.",
"Create and call a function called myFunction that returns the sum of a and b."
],
"tests": [
"assert((function(){if(typeof f !== \"undefined\" && f === a + b){return true;}else{return false;}})(), 'message: Your function should return the value of a + b.');"
],
"challengeSeed": [
"var a = 4;",
"var b = 5;",
"",
"function ourFunction(a, b) {",
" return a - b;",
"}",
"",
"// Only change code below this line.",
"",
"",
"",
"",
"// Only change code above this line.",
"",
"if(typeof myFunction !== \"undefined\"){",
"var f=myFunction(a,b);",
"(function(){return f;})();",
"}"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Escribe código Javascript reutilizable con funciones",
"descriptionEs": [
"En JavaScript, podemos dividir nuestro código en partes reutilizables llamadas funciones.",
"He aquí un ejemplo de una función:",
"function nombreDeFuncion(a, b) {",
"& nbsp; & nbsp; return a + b;",
"}",
"Después de escribir las líneas anteriores en nuestro código, podemos pasar valores a nuestra función y el resultado que sigue a la instrucción return será retornado.",
"Por ejemplo, podemos pasar los números 4 y 2 al \"llamar\" la función más adelante en nuestro código, así: nombreDeFuncion(4, 2). ",
"En este ejemplo, la función devolverá el número 6, ya que es el resultado de 4 + 2.",
"Crea y llama una función de nombre myFunction que devuelva la suma de a y b."
]
},
{
"id": "bg9998c9c99feddfaeb9bdef",
"title": "Build JavaScript Objects",
"description": [
"You may have heard the term object before.",
"Objects are similar to arrays, except that instead of using indexes to access and modify their data, you access the data in objects through what are called properties.",
"Here's a sample object:",
"var cat = {",
" \"name\": \"Whiskers\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"enemies\": [\"Water\", \"Dogs\"]",
"};",
"",
"Objects are useful for storing data in a structured way, and can represent real world objects, like a cat.",
"Let's try to make an object that represents a dog called myDog which contains the properties \"name\" (a string), \"legs\", \"tails\" and \"friends\".",
"You can set these object properties to whatever values you want, as long \"name\" is a string, \"legs\" and \"tails\" are numbers, and \"friends\" is an array."
],
"tests": [
"assert((function(z){if(z.hasOwnProperty(\"name\") && z.name !== undefined && typeof z.name === \"string\"){return true;}else{return false;}})(myDog), 'message: myDog should contain the property name and it should be a string.');",
"assert((function(z){if(z.hasOwnProperty(\"legs\") && z.legs !== undefined && typeof z.legs === \"number\"){return true;}else{return false;}})(myDog), 'message: myDog should contain the property legs and it should be a number.');",
"assert((function(z){if(z.hasOwnProperty(\"tails\") && z.tails !== undefined && typeof z.tails === \"number\"){return true;}else{return false;}})(myDog), 'message: myDog should contain the property tails and it should be a number.');",
"assert((function(z){if(z.hasOwnProperty(\"friends\") && z.friends !== undefined && Array.isArray(z.friends)){return true;}else{return false;}})(myDog), 'message: myDog should contain the property friends and it should be an array.');"
],
"challengeSeed": [
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"]",
"};",
"",
"// Only change code below this line.",
"",
"var myDog = {",
"",
"",
"",
"",
"};",
"",
"// Only change code above this line.",
"",
"(function(z){return z;})(myDog);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Construye objetos en JavaScript",
"descriptionEs": [
"Es posible que haya oído el término objeto antes.",
"Los objetos son similares a los vectores, excepto que en lugar de utilizar los índices para acceder y modificar sus datos, pueden accederse mediante lo que se llama propiedades.",
"Esto es un objeto de ejemplo:",
"var cat = {",
" \"name\": \"Whiskers\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"enemies\": [\"Water\", \"Dogs\"]",
"};",
"Los objetos son útiles para almacenar datos de manera estructurada, y pueden representar objetos del mundo real, como un gato.",
"Vamos a tratar de hacer un objeto que representa un perro, lo llamaremos mydog y contendrá las propiedades \"name\" (una cadena con el nombre), \"legs\" (piernas), \"tails\" (colas) y \"friends\" (amigos). ",
"Podrás establecer estas propiedades del objeto en los valores que desees, siempre y cuando \"name\" sea una cadena, \"legs\" y \"tails\" sean números, y \"friends\" sea un vector."
]
},
{
"id": "bg9999c9c99feddfaeb9bdef",
"title": "Update the Properties of a JavaScript Object",
"description": [
"After you've created a JavaScript object, you can update its properties at any time just like you would update any other variable.",
"For example, let's look at ourDog:",
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"]",
"};",
"Since he's a particularly happy dog, let's change his name to \"Happy Camper\". Here's how we update his object's name property:",
"ourDog.name = \"Happy Camper\";",
"Now when we run return ourDog.name, instead of getting \"Camper\", we'll get his new name, \"Happy Camper\".",
"Let's update the myDog object's name property. Let's change her name from \"Coder\" to \"Happy Coder\"."
],
"tests": [
"assert(/happy coder/gi.test(myDog.name), 'message: Update myDog's \"name\" property to equal \"Happy Coder\".');"
],
"challengeSeed": [
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"]",
"};",
"",
"ourDog.name = \"Happy Camper\";",
"",
"var myDog = {",
" \"name\": \"Coder\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"Free Code Camp Campers\"]",
"};",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"(function(z){return z;})(myDog);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Actualiza las propiedades de un objeto en JavaScript",
"descriptionEs": [
"Después de que hayas creado un objeto de JavaScript, puedes actualizar sus propiedades en cualquier momento, tal y como harías con cualquier otra variable.",
"Por ejemplo, echemos un vistazo a ourDog:",
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"]",
"};",
"Dado que es un perro particularmente feliz, vamos a cambiar su nombre a \"Happy Camper\". Así es como actualizamos la propiedad nombre del objeto: ",
"ourDog.name = \"Happy Camper\";",
"Ahora, cuando ejecutemos return ourDog.name, en lugar de obtener \"Camper\", vamos a recibir su nuevo nombre, \"Happy Camper\".",
"Vamos a actualizar la propiedad del objeto mydog. Cambiemos su nombre de \"Coder\" a \"Happy Coder\"."
]
},
{
"id": "bg9999c9c99feedfaeb9bdef",
"title": "Add New Properties to a JavaScript Object",
"description": [
"You can add new properties to existing JavaScript objects the same way you would modify them.",
"Here's how we would add a \"bark\" property to ourDog:",
"ourDog.bark = \"bow-wow\";",
"Now when we run return ourDog.bark, we'll get his bark, \"bow-wow\".",
"Let's add a \"bark\" property to myDog and set it to a dog sound, such as \"woof\"."
],
"tests": [
"assert(myDog.bark !== undefined, 'message: Add the property \"bark\" to myDog.');"
],
"challengeSeed": [
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"]",
"};",
"",
"ourDog.bark = \"bow-wow\";",
"",
"var myDog = {",
" \"name\": \"Happy Coder\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"Free Code Camp Campers\"]",
"};",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"(function(z){return z;})(myDog);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Añade nuevas propiedades a un objeto JavaScript",
"descriptionEs": [
"Puedes añadir nuevas propiedades a objetos existente de la misma forma que usarías para modificarlos.",
"Así es como añadimos una propiedad \"bark\" (ladra) a nuestro objeto ourDog:",
"ourDog.bark = \"bow-wow\";",
"Ahora, cuando ejecutemos return ourDog.bark, vamos a recbir su ladrido, \" bow-wow \".",
"Vamos a añadir una propiedad ladra a myDog y a ponerle un sonido de perro, tal como \"woof\"."
]
},
{
"id": "bg9999c9c99fdddfaeb9bdef",
"title": "Delete Properties from a JavaScript Object",
"description": [
"We can also delete properties from objects like this:",
"delete ourDog.bark;",
"Let's delete the \"tails\" property from myDog."
],
"tests": [
"assert(myDog.tails === undefined, 'message: Delete the property \"tails\" from myDog.');"
],
"challengeSeed": [
"var ourDog = {",
" \"name\": \"Camper\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"everything!\"],",
" \"bark\": \"bow-wow\"",
"};",
"",
"delete ourDog.bark;",
"",
"var myDog = {",
" \"name\": \"Happy Coder\",",
" \"legs\": 4,",
" \"tails\": 1,",
" \"friends\": [\"Free Code Camp Campers\"],",
" \"bark\": \"woof\"",
"};",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"(function(z){return z;})(myDog);"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Elimina propiedades de un objeto JavaScript",
"descriptionEs": [
"También podemos eliminar propiedades de los objetos de esta manera:",
"delete ourDog.bark;",
"Borremos la propiedad \"tails\" de myDog."
]
},
{
"id": "cf1111c1c11feddfaeb5bdef",
"title": "Iterate with JavaScript For Loops",
"description": [
"You can run the same code multiple times by using a loop.",
"The most common type of JavaScript loop is called a \"for loop\" because it runs \"for\" a specific number of times.",
"For loops are declared with three optional expressions seperated by semicolons:",
"for ([initialization]; [condition]; [final-expression])",
"The initialization statement is executed one time only before the loop starts. It is typically used to define and setup your loop variable.",
"The condition statement is evaluated at the beginning of every loop iteration and will continue as long as it evalutes to true. When condition is false at the start of the iteration, the loop will stop executing. This means if condition starts as false, your loop will never execute.",
"The final-expression is executed at the end of each loop iteration, prior to the next condition check and is usually used to increment or decrement your loop counter.",
"In the following example we initialize with i = 0 and iterate while our condition i < 5 is true. We'll increment i by 1 in each loop iteration with i++ as our final-expression.",
"var ourArray = [];",
"for (var i = 0; i < 5; i++) {",
" ourArray.push(i);",
"}",
"ourArray will now contain [0,1,2,3,4].",
"Let's use a for loop to work to push the values 1 through 5 onto myArray."
],
"tests": [
"assert(editor.getValue().match(/for\\s*\\(/g).length > 1, 'message: You should be using a for loop for this.');",
"assert.deepEqual(myArray, [1,2,3,4,5], 'message: myArray should equal [1,2,3,4,5].');"
],
"challengeSeed": [
"var ourArray = [];",
"",
"for (var i = 0; i < 5; i++) {",
" ourArray.push(i);",
"}",
"",
"var myArray = [];",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"if(typeof myArray !== \"undefined\"){(function(){return myArray;})();}",
""
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Iterar con JavaScript en ciclos",
"descriptionEs": [
"Puede ejecutar el mismo código varias veces mediante el uso de un ciclo.",
"El tipo más común de bucle de JavaScript se llama \"ciclo for\"porque se ejecuta \"por\" (for) un número específico de veces.",
"Los ciclos for se declaran con tres expresiones opcionales separadas por punto y coma:",
"for ([inicialización]; [condición]; [expresión-final])",
"La inicialización se ejecuta sólo una vez antes de que empiece el ciclo. Normalmente se utiliza para definir e inicializar su variable de ciclo. ",
"La expresión condición se evalúa al principio de cada iteración del ciclo y continuará en el ciclo siempre y cuando sea verdadera (true). Cuando la condición sea falsa (false) al comienzo de la iteración, se detendrá la ejecución del ciclo. Esto significa que si la condición inicia en el valor falso false, el ciclo no se ejecutará. ",
"La expresión final se ejecuta al final de cada repetición del ciclo, antes del siguiente chequeo de la condición y se utiliza generalmente para aumentar o disminuir el contador del ciclo.",
"En el siguiente ejemplo inicializamos con i = 0 e iteramos mientras nuestra condición i <5 sea verdadera. Vamos a incrementar i en 1 en cada iteración del ciclo con i++ como nuestra expresión final. ",
"var ourArray = [];",
"for (var i = 0; i < 5; i++) {",
" ourArray.push(i);",
"}",
"ourArray ahora contendrá [0,1,2,3,4].",
"Vamos a utilizar un ciclo for para empujar los valores del 1 al 5 en myArray."
]
},
{
"id": "56104e9e514f539506016a5c",
"title": "Iterate Odd Numbers With a For Loop",
"description": [
"For loops don't have to iterate one at a time. By changing our final-expression, we can count by even numbers.",
"We'll start at i = 0 and loop while i < 10. We'll increment i by 2 each loop with i += 2.",
"var ourArray = [];",
"for (var i = 0; i < 10; i += 2) {",
" ourArray.push(i);",
"}",
"ourArray will now contain [0,2,4,6,8].",
"Let's change our initialization and final-expression so we can count by odd numbers.",
"Push the odd numbers from 1 through 9 to myArray using a for loop."
],
"tests": [
"assert(editor.getValue().match(/for\\s*\\(/g).length > 1, 'message: You should be using a for loop for this.');",
"assert.deepEqual(myArray, [1,3,5,7,9], 'message: myArray should equal [1,3,5,7,9].');"
],
"challengeSeed": [
"var ourArray = [];",
"",
"for (var i = 0; i < 10; i += 2) {",
" ourArray.push(i);",
"}",
"",
"var myArray = [];",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"if(typeof myArray !== \"undefined\"){(function(){return myArray;})();}",
""
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Itera por los números pares con un ciclo for",
"descriptionEs": [
"Los ciclos for no siempre iteran incrementado de a uno. Cambiando nuestra expresión final, podemos contar los números pares.",
"Vamos a empezar con i = 0 e iterar mientras i <10. Vamos a incrementar i de a 2 en cada iteración i + = 2. ",
"var ourArray = [];",
"for (var i = 0; i < 10; i += 2) {",
" ourArray.push(i);",
"}",
"ourArray ahora contendrá [0,2,4,6,8].",
"Vamos a cambiar nuestra inicialización y expresión final para que podamos contar los números impares.",
"Empuja los números impares del 1 al 9 en myArray utilizando un ciclo for."
]
},
{
"id": "56105e7b514f539506016a5e",
"title": "Count Backwards With a For Loop",
"description": [
"A for loop can also count backwards, so long as we can define the right conditions.",
"In order to count backwards by twos, we'll need to change our initialization, condition, and final-expression.",
"We'll start at i = 10 and loop while i > 0. We'll decrement i by 2 each loop with i -= 2.",
"var ourArray = [];",
"for (var i = 10; i > 0; i -= 2) {",
" ourArray.push(i);",
"}",
"ourArray will now contain [10,8,6,4,2].",
"Let's change our initialization and final-expression so we can count backward by twos by odd numbers.",
"Push the odd numbers from 9 through 1 to myArray using a for loop."
],
"tests": [
"assert(editor.getValue().match(/for\\s*\\(/g).length > 1, 'message: You should be using a for loop for this.');",
"assert.deepEqual(myArray, [9,7,5,3,1], 'message: myArray should equal [9,7,5,3,1].');"
],
"challengeSeed": [
"var ourArray = [];",
"",
"for (var i = 10; i > 0; i -= 2) {",
" ourArray.push(i);",
"}",
"",
"var myArray = [];",
"",
"// Only change code below this line.",
"",
"",
""
],
"tail": [
"if(typeof myArray !== \"undefined\"){(function(){return myArray;})();}"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Cuenta hacia atrás con un ciclo for",
"descriptionEs": [
"Un ciclo también puede contar hacia atrás, siempre y cuando definamos las condiciones adecuadas.",
"Para contar hacia atrás de dos en dos, tendremos que cambiar nuestra inicialización, la condición y la última-expresión.",
"Vamos a empezar con i = 10 e iteraremos mientras i > 0. Vamos a decrementar i de a 2 por cada iteración con i -= 2. ",
"var ourArray = [];",
"for (var i = 10; i > 0; i -= 2) {",
" ourArray.push(i);",
"}",
"ourArray ahora contendrá [10,8,6,4,2].",
"Vamos a cambiar nuestra inicialización y la expresión final para que podamos contar hacia atrás de dos en dos pero números impares.",
"Empuja los números impares del 9 a 1 en myArray utilizando un ciclo for."
]
},
{
"id": "cf1111c1c11feddfaeb1bdef",
"title": "Iterate with JavaScript While Loops",
"description": [
"You can run the same code multiple times by using a loop.",
"Another type of JavaScript loop is called a \"while loop\", because it runs \"while\" something is true and stops once that something is no longer true.",
"var ourArray = [];",
"var i = 0;",
"while (i < 5) {",
" ourArray.push(i);",
" i++;",
"}",
"Let's try getting a while loop to work by pushing values to an array.",
"Push the numbers 0 through 4 to myArray using a while loop."
],
"tests": [
"assert(editor.getValue().match(/while/g), 'message: You should be using a while loop for this.');",
"assert.deepEqual(myArray, [0,1,2,3,4], 'message: myArray should equal [0,1,2,3,4].');"
],
"challengeSeed": [
"var myArray = [];",
"",
"// Only change code below this line.",
"",
"",
"",
"// Only change code above this line.",
"",
"if(typeof myArray !== \"undefined\"){(function(){return myArray;})();}",
""
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Iterar con JavaScript con ciclos while",
"descriptionEs": [
"Puede ejecutar el mismo código varias veces mediante el uso de un ciclo.",
"Otro tipo de ciclo de JavaScript se llama un ciclo \"while\", ya que se ejecuta, \"mientras que\" algo sea cierto y se detiene una vez que ya no sea así.",
"var ourArray = [];",
"var i = 0;",
"while(i < 5) {",
" ourArray.push(i);",
" i++;",
"}",
"Intentemos que un ciclo while empuje valores en un vector.",
"Empuja los números de 0 a 4 para myArray utilizando un ciclo while."
]
},
{
"id": "cf1111c1c11feddfaeb9bdef",
"title": "Generate Random Fractions with JavaScript",
"description": [
"Random numbers are useful for creating random behavior.",
"JavaScript has a Math.random() function that generates a random decimal number between 0 and 1.",
"Change myFunction to return a random number instead of returning 0.",
"Note that you can return a function, just like you would return a variable or value."
],
"tests": [
"assert(typeof myFunction() === \"number\", 'message: myFunction should return a random number.');",
"assert((myFunction()+''). match(/\\./g), 'message: The number returned by myFunction should be a decimal.');",
"assert(editor.getValue().match(/Math\\.random/g).length >= 0, 'message: You should be using Math.random to generate the random decimal number.');"
],
"challengeSeed": [
"function myFunction() {",
"",
" // Only change code below this line.",
"",
" return 0;",
"",
" // Only change code above this line.",
"}",
"",
"(function(){return myFunction();})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Generar fracciones al azar con JavaScript",
"descriptionEs": [
"Los números aleatorios son útiles para crear un comportamiento aleatorio.",
"JavaScript tiene una función Math.random() que genera un número decimal aleatorio.",
"Cambia myFunction para que devuelva un número al azar en lugar de devolver 0.",
"Ten en cuenta que puedes retornar lo retornado por una función, igual que harías para devolver una variable o valor."
]
},
{
"id": "cf1111c1c12feddfaeb1bdef",
"title": "Generate Random Whole Numbers with JavaScript",
"description": [
"It's great that we can generate random decimal numbers, but it's even more useful if we use it to generate random whole numbers.",
"First, let's use Math.random() to generate a random decimal.",
"Then let's multiply this random decimal by 20.",
"Finally, let's use another function, Math.floor() to round the number down to its nearest whole number.",
"This technique will gives us a whole number between 0 and 19.",
"Note that because we're rounding down, it's impossible to actually get 20.",
"Putting everything together, this is what our code looks like:",
"Math.floor(Math.random() * 20);",
"See how Math.floor takes (Math.random() * 20) as its argument? That's right - you can pass a function to another function as an argument.",
"Let's use this technique to generate and return a random whole number between 0 and 9."
],
"tests": [
"assert(editor.getValue().match(/var\\srandomNumberBetween0and19\\s=\\sMath.floor\\(Math.random\\(\\)\\s\\*\\s20\\);/).length == 1, 'message: The first line of code should not be changed.');",
"assert(typeof myFunction() === \"number\" && (function(){var r = myFunction();return Math.floor(r) === r;})(), 'message: The result of myFunction should be a whole number.');",
"assert(editor.getValue().match(/Math.random/g).length > 1, 'message: You should be using Math.random to generate a random number.');",
"assert(editor.getValue().match(/\\(\\s*?Math.random\\s*?\\(\\s*?\\)\\s*?\\*\\s*?10\\s*?\\)/g) || editor.getValue().match(/\\(\\s*?10\\s*?\\*\\s*?Math.random\\s*?\\(\\s*?\\)\\s*?\\)/g), 'message: You should have multiplied the result of Math.random by 10 to make it a number that is between zero and nine.');",
"assert(editor.getValue().match(/Math.floor/g).length > 1, 'message: You should use Math.floor to remove the decimal part of the number.');"
],
"challengeSeed": [
"var randomNumberBetween0and19 = Math.floor(Math.random() * 20);",
"",
"function myFunction() {",
"",
" // Only change code below this line.",
"",
" return Math.random();",
"",
" // Only change code above this line.",
"}"
],
"tail": [
"(function(){return myFunction();})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Genera números aleatorios enteros con JavaScript",
"descriptionEs": [
"Es muy bueno que podamos generar números decimales al azar, pero es aún más útil si lo utilizamos para generar números enteros aleatorios.",
"En primer lugar, vamos a usar Math.random() para generar un decimal aleatorio.",
"Entonces vamos a multiplicar este decimal azar por 20.",
"Por último, vamos a usar otra función, Math.floor() para redondear el número hasta su número entero más próximo.",
"Esta técnica nos da un número entero entre 0 y 19.",
"Tenga en cuenta que debido a que estamos redondeando, es imposible obtener 20.",
"Poniendo todo junto, así es como se ve nuestro código:",
"Math.floor(Math.random() * 20);",
"¿Ves como Math.floor toma (Math.random() * 20) como su argumento? Así es - puedes pasar el resultado de un función como argumento de otra función.",
"usemos esta técnica para generar y devolver un número entero aleatorio entre 0 y 9."
]
},
{
"id": "cf1111c1c12feddfaeb2bdef",
"title": "Generate Random Whole Numbers within a Range",
"description": [
"Instead of generating a random number between zero and a given number like we did before, we can generate a random number that falls within a range of two specific numbers.",
"To do this, we'll define a minimum number min and a maximum number max.",
"Here's the formula we'll use. Take a moment to read it and try to understand what this code is doing:",
"Math.floor(Math.random() * (max - min + 1)) + min",
"Define two variables: myMin and myMax, and set them both equal to numbers.",
"Then create a function called myFunction that returns a random number that's greater than or equal to myMin, and is less than or equal to myMax."
],
"tests": [
"assert(myFunction() >= myMin, 'message: The random number generated by myFunction should be greater than or equal to your minimum number, myMin.');",
"assert(myFunction() <= myMax, 'message: The random number generated by myFunction should be less than or equal to your maximum number, myMax.');",
"assert(myFunction() % 1 === 0 , 'message: The random number generated by myFunction should be an integer, not a decimal.');",
"assert((function(){if(editor.getValue().match(/myMax/g).length > 1 && editor.getValue().match(/myMin/g).length > 2 && editor.getValue().match(/Math.floor/g) && editor.getValue().match(/Math.random/g)){return true;}else{return false;}})(), 'message: myFunction() should use use both myMax and myMin, and return a random number in your range.');"
],
"challengeSeed": [
"var ourMin = 1;",
"",
"var ourMax = 9;",
"",
"function ourFunction() {",
"",
" return Math.floor(Math.random() * (ourMax - ourMin + 1)) + ourMin;",
"",
"}",
"",
"// Only change code below this line.",
"",
"var myMin;",
"",
"var myMax;",
"",
"function myFunction() {",
"",
" return;",
"",
"}",
"",
"// Only change code above this line.",
"",
"",
"(function(){return myFunction();})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Genera números aleatorios enteros dentro de un rango",
"descriptionEs": [
"En lugar de generar un número aleatorio entre cero y un número dado como lo hicimos antes, podemos generar un número aleatorio que caiga dentro de un rango de dos números específicos.",
"Para ello, vamos a definir un número mínimo min y un número máximo max.",
"He aquí la fórmula que utilizaremos. Tómate un momento para leer y tratar de entender lo que el código está haciendo: ",
"Math.floor(Math.random() * (max - min + 1)) + min",
"Definir dos variables: myMin y myMax, y asignales valores enteros.",
"A continuación, crea una función llamada myFunction que devuelva un número aleatorio mayor o igual a myMin, y menor o igual a myMax. "
]
},
{
"id": "cf1111c1c12feddfaeb3bdef",
"title": "Use Conditional Logic with If and Else Statements",
"description": [
"We can use if statements in JavaScript to only execute code if a certain condition is met.",
"if statements require some sort of boolean condition to evaluate.",
"For example:",
"var x = 1;",
"if (x === 2) {",
" return 'x is 2';",
"} else {",
" return 'x is not 2';",
"}",
"Let's use if and else statements to make a coin-flip game.",
"Create if and else statements to return the string \"heads\" if the flip variable is zero, or else return the string \"tails\" if the flip variable is not zero."
],
"tests": [
"assert(editor.getValue().match(/if/g).length >= 2, 'message: Create a new if statement.');",
"assert(editor.getValue().match(/else/g).length >= 1, 'message: Created a new else statement.');",
"assert((function(){var result = myFunction();if(result === 'heads' || result === 'tails'){return true;} else {return false;}})(), 'message: myFunction should either return heads or tails.');",
"assert((function(){var result = myFunction();if(result === 'heads' && flip === 0 || result === 'tails' && flip !== 0){return true;} else {return false;}})(), 'message: myFunction should return heads when flip equals 0 and tails when flip equals 1.');"
],
"challengeSeed": [
"var flip = Math.floor(Math.random() * (1 - 0 + 1)) + 0;",
"",
"function myFunction() {",
"",
" // Only change code below this line.",
"",
"",
"",
" // Only change code above this line.",
"",
"}",
"",
"var result = myFunction();if(typeof flip !== \"undefined\" && typeof flip === \"number\" && typeof result !== \"undefined\" && typeof result === \"string\"){(function(y,z){return 'flip = ' + y.toString() + ', text = ' + z;})(flip, result);}"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Usa lógica condicional con instrucciones if y else",
"descriptionEs": [
"Podemos usar instrucciones if (\"if\" es \"si\" en español) en JavaScript para ejecutar código sólo cuando cierta condición se cumpla.",
"Las instrucciones if requieren evaluar algún tipo de condición booleana.",
"Por ejemplo:",
"if (1 === 2) {",
" return true;",
"} else {",
" return false;",
"}",
"Vamos a usar la instrucción if con else (\"else\" puede traducirse como \"de lo contrario\") para hacer un juego de cara o sello.",
"Crea una instrucción if con else que retorne la cadena \"heads\" si la variable flip es cero, o bien que retorne \"tails\" si la variable flip no es cero. "
]
},
{
"id": "cf1111c1c12feddfaeb6bdef",
"title": "Sift through Text with Regular Expressions",
"description": [
"Regular expressions are used to find certain words or patterns inside of strings.",
"For example, if we wanted to find the word the in the string The dog chased the cat, we could use the following regular expression: /the/gi",
"Let's break this down a bit:",
"the is the pattern we want to match.",
"g means that we want to search the entire string for this pattern instead of just the first match.",
"i means that we want to ignore the case (uppercase or lowercase) when searching for the pattern.",
"Regular expressions are written by surrounding the pattern with / symbols.",
"Let's try selecting all the occurrences of the word and in the string Ada Lovelace and Charles Babbage designed the first computer and the software that would have run on it.",
"We can do this by replacing the . part of our regular expression with the word and."
],
"tests": [
"assert(myTest==2, 'message: Your regular expression should find two occurrences of the word and.');",
"assert(editor.getValue().match(/\\/and\\/gi/), 'message: Use regular expressions to find the word and in testString.');"
],
"challengeSeed": [
"var myTest = (function() {",
" var testString = \"Ada Lovelace and Charles Babbage designed the first computer and the software that would have run on it.\";",
" var expressionToGetSoftware = /software/gi;",
"",
" // Only change code below this line.",
"",
" var expression = /./gi;",
"",
" // Only change code above this line.",
"",
" return testString.match(expression).length;",
"})();(function(){return myTest;})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Examina un texto con expresiones regulares",
"descriptionEs": [
"Las expresiones regulares se utilizan para encontrar ciertas palabras o patrones dentro de cadenas.",
"Por ejemplo, si quisiéramos encontrar la palabra el en la cadena El perro persiguió al gato el lunes, podríamos utilizar la siguiente expresión regular: /el/gi ",
"Vamos a dividirla un poco:",
"el es el patrón con el que queremos coincidir.",
"g significa que queremos buscar el patrón en toda la cadena y no sólo la primera ocurrencia.",
"i significa que queremos ignorar la capitalización (en mayúsculas o minúsculas) cuando se busque el patrón.",
"Las expresiones regulares se escriben rodeando el patrón con símbolos de barra /.",
"Vamos a tratar de seleccionar todas las apariciones de la palabra and en la cadena Ada Lovelace and Charles Babbage designed the first computer and the software that would have run on it.",
"Podemos hacer esto sustituyendo la parte . de nuestra expresión regular por la palabra and."
]
},
{
"id": "cf1111c1c12feddfaeb7bdef",
"title": "Find Numbers with Regular Expressions",
"description": [
"We can use special selectors in Regular Expressions to select a particular type of value.",
"One such selector is the digit selector \\d which is used to retrieve the numbers in a string.",
"It is used like this: /\\d/g.",
"For numbers this is often written as /\\d+/g, where the + following the digit selector allows this regular expression to match multi-digit numbers.",
"Use the \\d selector to select the number of numbers in the string, allowing for the possibility of multi-digit numbers."
],
"tests": [
"assert(editor.getValue().match(/\\/\\\\d\\+\\//g), 'message: Use the /\\d+/g regular expression to find the numbers in testString.');",
"assert(myTest === 2, 'message: Your regular expression should find two numbers in testString.');"
],
"challengeSeed": [
"var myTest = (function() {",
"",
" var testString = \"There are 3 cats but 4 dogs.\";",
"",
" // Only change code below this line.",
"",
" var expression = /.+/g;",
"",
" // Only change code above this line.",
"",
" return testString.match(expression).length;",
"",
"})();(function(){return myTest;})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Encuentra números con expresiones regulares",
"descriptionEs": [
"Podemos usar selectores especiales en las expresiones regulares para seleccionar un determinado tipo de valor.",
"Uno de estos selectores es el de dígitos \\d que se utiliza para hacer coincidir números en una cadena.",
"Se usa así para hacer coincidir un dígito: /\\d/g.",
"Para hacer coincidir números de varios dígtios a menudo se escribe /\\d+/ g , donde el + que sigue al selector de dígito le permite a la expresión regular coincidir con uno o más dígito es decir coincide con números de varios dígitos.",
"Usa el selector \\d para hacer coincidir todos los números de la cadena, permitiendo la posibilidad de hacer coincidir números de varios dígitos."
]
},
{
"id": "cf1111c1c12feddfaeb8bdef",
"title": "Find Whitespace with Regular Expressions",
"description": [
"We can also use regular expression selectors like \\s to find whitespace in a string.",
"The whitespace characters are \" \" (space), \\r (the carriage return), \\n (newline), \\t (tab), and \\f (the form feed).",
"The whitespace regular expression looks like this:",
"/\\s+/g",
"Use it to select all the whitespace characters in the sentence string."
],
"tests": [
"assert(editor.getValue().match(/\\/\\\\s\\+\\//g), 'message: Use the /\\s+/g regular expression to find the spaces in testString.');",
"assert(myTest === 7, 'message: Your regular expression should find seven spaces in testString.');"
],
"challengeSeed": [
"var myTest = (function(){",
" var testString = \"How many spaces are there in this sentence?\";",
"",
" // Only change code below this line.",
"",
" var expression = /.+/g;",
"",
" // Only change code above this line.",
"",
" return testString.match(expression).length;",
"",
"})();(function(){return myTest;})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Encuentra espacios en blanco con las expresiones regulares",
"descriptionEs": [
"También podemos utilizar selectores de expresiones regulares como \\s para encontrar un espacio en blanco en una cadena.",
"Los espacios en blanco son \" \" (espacio), \\r (el retorno de carro), \\n (nueva línea), \\t (tabulador), y \\f (el avance de página). ",
"Una expresión regular con el selector de espacios en blanco puede ser:",
"/\\s+/g",
"Se usa para hacer coincidir todos los espacios en blanco en una cadena."
]
},
{
"id": "cf1111c1c13feddfaeb3bdef",
"title": "Invert Regular Expression Matches with JavaScript",
"description": [
"You can invert any match by using the uppercase version of the regular expression selector.",
"For example, \\s will match any whitespace, and \\S will match anything that isn't whitespace.",
"Use /\\S/g to count the number of non-whitespace characters in testString."
],
"tests": [
"assert(editor.getValue().match(/\\/\\\\S\\/g/g), 'message: Use the /\\S/g regular expression to find non-space characters in testString.');",
"assert(myTest === 49, 'message: Your regular expression should find forty nine non-space characters in the testString.');"
],
"challengeSeed": [
"var myTest = (function(){",
" var testString = \"How many non-space characters are there in this sentence?\";",
"",
" // Only change code below this line.",
"",
" var expression = /./g;",
"",
" // Only change code above this line.",
"",
" return testString.match(expression).length;",
"})();(function(){return myTest;})();"
],
"type": "waypoint",
"challengeType": 1,
"nameEs": "Hacer coincidir con una expresión regular invertida",
"descriptionEs": [
"Puedes invertir las coincidencias de un selector usando su versión en mayúsculas.",
"Por ejemplo, \\s coincidirá con cualquier espacio en blanco, mientras que \\S coincidirá con todo lo que no sea espacio en blanco.",
"Usa /\\S/g para contar el número de caracteres que no están en blanco en testString."
]
},
{
"id": "cf1111c1c12feddfaeb9bdef",
"title": "Create a JavaScript Slot Machine",
"isBeta": true,
"description": [
"We are now going to try and combine some of the stuff we've just learned and create the logic for a slot machine game.",
"For this we will need to generate three random numbers between 1 and 3 to represent the possible values of each individual slot.",
"Store the three random numbers in slotOne, slotTwo and slotThree.",
"Generate the random numbers by using the system we used earlier (an explanation of the formula can be found here):",
"Math.floor(Math.random() * (3 - 1 + 1)) + 1;"
],
"tests": [
"assert(typeof runSlots($(\".slot\"))[0] === \"number\" && runSlots($(\".slot\"))[0] > 0 && runSlots($(\".slot\"))[0] < 4, 'message: slotOne should be a random number.');",
"assert(typeof runSlots($(\".slot\"))[1] === \"number\" && runSlots($(\".slot\"))[1] > 0 && runSlots($(\".slot\"))[1] < 4, 'message: slotTwo should be a random number.');",
"assert(typeof runSlots($(\".slot\"))[2] === \"number\" && runSlots($(\".slot\"))[2] > 0 && runSlots($(\".slot\"))[2] < 4, 'message: slotThree should be a random number.');",
"assert((function(){if(code.match(/Math\\.floor\\(\\s?Math\\.random\\(\\)\\s?\\*\\s?\\(\\s?3\\s?\\-\\s?1\\s?\\+\\s?1\\s?\\)\\s?\\)\\s?\\+\\s?1/gi) !== null){return code.match(/slot.*?=.*?\\(.*?\\).*?/gi).length >= 3;}else{return false;}})(), 'message: You should have used Math.floor(Math.random() * (3 - 1 + 1)) + 1; three times to generate your random numbers.');"
],
"challengeSeed": [
"fccss",
" function runSlots() {",
" var slotOne;",
" var slotTwo;",
" var slotThree;",
" ",
" var images = [\"http://i.imgur.com/9H17QFk.png\", \"http://i.imgur.com/9RmpXTy.png\", \"http://i.imgur.com/VJnmtt5.png\"];",
" ",
" // Only change code below this line.",
" ",
" ",
" ",
" // Only change code above this line.",
" ",
" ",
" if (slotOne !== undefined && slotTwo !== undefined && slotThree !== undefined) {",
" $(\".logger\").html(slotOne + \" \" + slotTwo + \" \" + slotThree);",
" }",
" ",
" ",
" $(\".logger\").append(\" Not A Win\")",
" return [slotOne, slotTwo, slotThree];",
" }",
"",
" $(document).ready(function() {",
" $(\".go\").click(function() {",
" runSlots();",
" });",
" });",
"fcces",
" ",
"",
"
",
"",
""
],
"type": "waypoint",
"challengeType": 0,
"nameEs": "Crea una máquina tragamonedas en JavaScript",
"descriptionEs": [
"Ahora vamos a tratar de combinar algunas de las cosas que hemos aprendido para crear la lógica de una máquina tragamonedas.",
"Para esto tendremos que generar tres números aleatorios entre ",
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" ![\"learn](\"https://s3.amazonaws.com/freecodecamp/freecodecamp_logo.svg.gz\")
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" FCC Slot Machine
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" 1 y 3 que representen los valores posibles de cada casilla.",
"Guarda los tres números aleatorios en slotOne, slotTwo y slotThree.",
"Genera los números aleatorios utilizando el sistema que usamos anteriormente (puedes encontrar una explicación de la fórmula aquí):",
"Math.floor(Math.random() * (3 - 1 + 1)) + 1;"
]
},
{
"id": "cf1111c1c13feddfaeb1bdef",
"title": "Add your JavaScript Slot Machine Slots",
"isBeta": true,
"description": [
"Now that our slots will each generate random numbers, we need to check whether they've all returned the same number.",
"If they have, we should notify our user that they've won and we should return null.",
"null is a JavaScript data structure that means nothing.",
"The user wins when all the three numbers match. Let's create an if statement with multiple conditions in order to check whether all numbers are equal.",
"if(slotOne === slotTwo && slotTwo === slotThree){",
" return null;",
"}",
"Also, we need to show the user that he has won the game when he gets the same number in all the slots.",
"If all three numbers match, we should also set the text \"It's A Win\" to the element with class logger."
],
"tests": [
"assert((function(){var data = runSlots();return data === null || data.toString().length === 1;})(), 'message: If all three of our random numbers are the same we should return that number. Otherwise we should return null.');"
],
"challengeSeed": [
"fccss",
" function runSlots() {",
" var slotOne;",
" var slotTwo;",
" var slotThree;",
" ",
" var images = [\"http://i.imgur.com/9H17QFk.png\", \"http://i.imgur.com/9RmpXTy.png\", \"http://i.imgur.com/VJnmtt5.png\"];",
" ",
" slotOne = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotTwo = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotThree = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" ",
" ",
" // Only change code below this line.",
" ",
" ",
" ",
" // Only change code above this line.",
" ",
" if(slotOne !== undefined && slotTwo !== undefined && slotThree !== undefined){",
" $(\".logger\").html(slotOne + \" \" + slotTwo + \" \" + slotThree);",
" }",
" ",
" $(\".logger\").append(\" Not A Win\");",
" ",
" return [slotOne, slotTwo, slotThree];",
" }",
"",
" $(document).ready(function() {",
" $(\".go\").click(function() {",
" runSlots();",
" });",
" });",
"fcces",
" ",
"",
"
",
"",
""
],
"type": "waypoint",
"challengeType": 0,
"nameEs": "Añade casillas a tu tragamonedas JavaScript",
"descriptionEs": [
"Ahora que cada una de nuestras casillas genera números aleatorios, tenemos que comprobar si todos quedan con el mismo número.",
"Si es así, debemos notificar a nuestros usuarios que han ganado y debemos retornar ",
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" null.",
"null es una estructura de datos de JavaScript que significa \"nada\".",
"El usuario gana cuando los tres números coinciden. Cremos una instrucción if con varias condiciones, a fin de comprobar si todos los números son iguales. ",
"if(slotOne === slotTwo && slotTwo === slotThree){",
" return null;",
"}",
"Además, tenemos que mostrar al usuario que ha ganado la partida e caso de que esté el mismo número en todas las casillas.",
"Si los tres números coinciden, también hay que poner el texto \"It's A Win\" en el elemento HTML con clase logger."
]
},
{
"id": "cf1111c1c13feddfaeb2bdef",
"title": "Bring your JavaScript Slot Machine to Life",
"isBeta": true,
"description": [
"Now we can detect a win. Let's get this slot machine working.",
"Let's use the jQuery selector $(\".slot\") to select all of the slots.",
"Once they are all selected, we can use bracket notation to access each individual slot:",
"$($(\".slot\")[0]).html(slotOne);",
"This jQuery will select the first slot and update it's HTML to display the correct number.",
"Use the above selector to display each number in its corresponding slot."
],
"tests": [
"assert((function(){runSlots();if($($(\".slot\")[0]).html().replace(/\\s/gi, \"\") !== \"\" && $($(\".slot\")[1]).html().replace(/\\s/gi, \"\") !== \"\" && $($(\".slot\")[2]).html().replace(/\\s/gi, \"\") !== \"\"){return true;}else{return false;}})(), 'message: You should be displaying the result of the slot numbers in the corresponding slots.');",
"assert((code.match( /\\$\\s*?\\(\\s*?\\$\\s*?\\(\\s*?(?:'|\")\\s*?\\.slot\\s*?(?:'|\")\\s*?\\)\\[\\d\\]\\s*?\\)/gi) && code.match( /\\$\\s*?\\(\\s*?\\$\\s*?\\(\\s*?(?:'|\")\\s*?\\.slot\\s*?(?:'|\")\\s*?\\)\\[\\d\\]\\s*?\\)/gi ).length >= 3 && code.match( /\\.html\\(slotOne\\)/gi ) && code.match( /\\.html\\(slotTwo\\)/gi ) && code.match( /\\.html\\(slotThree\\)/gi )), 'message: You should have used the the selector given in the description to select each slot and assign it the value of slotOne, slotTwo and slotThree respectively.');"
],
"challengeSeed": [
"fccss",
" function runSlots() {",
" var slotOne;",
" var slotTwo;",
" var slotThree;",
" ",
" var images = [\"http://i.imgur.com/9H17QFk.png\", \"http://i.imgur.com/9RmpXTy.png\", \"http://i.imgur.com/VJnmtt5.png\"];",
" ",
" slotOne = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotTwo = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotThree = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" ",
" ",
" // Only change code below this line.",
" ",
" ",
" ",
" // Only change code above this line.",
" ",
" if (slotOne === slotTwo && slotTwo === slotThree) {",
" $(\".logger\").html(\" It's A Win\")",
" return null;",
" }",
" ",
" if(slotOne !== undefined && slotTwo !== undefined && slotThree !== undefined){",
" $(\".logger\").html(slotOne + \" \" + slotTwo + \" \" + slotThree);",
" }",
" ",
" $(\".logger\").append(\" Not A Win\");",
" ",
" ",
" return [slotOne, slotTwo, slotThree];",
" }",
"",
" $(document).ready(function() {",
" $(\".go\").click(function() {",
" runSlots();",
" });",
" });",
"fcces",
" ",
"",
"
",
"",
""
],
"type": "waypoint",
"challengeType": 0,
"nameEs": "Da vida a tu máquina tragamonedas en JavaScript",
"descriptionEs": [
"Ahora podemos detectar una victoria. Logremos que la máquina tragamonedas funcione. ",
"Usemos un ",
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" selector de jQuery $(\".slot\") para seleccionar todas las casillas.",
"Una vez que todas estén seleccionados, podemos usar notación de corchetes para acceder a cada casilla individual:",
"$($(\".slot\")[0]).html(slotOne);",
"Este jQuery seleccionará la primera ranura y actualizará su HTML para mostrar el número correcto.",
"Usa el selector anterior para mostrar cada número en su casilla correspondiente."
]
},
{
"id": "cf1111c1c11feddfaeb1bdff",
"title": "Give your JavaScript Slot Machine some Stylish Images",
"isBeta": true,
"description": [
"Now let's add some images to our slots.",
"We've already set up the images for you in an array called images. We can use different indexes to grab each of these.",
"Here's how we would set the first slot to show a different image depending on which number its random number generates:",
"$($('.slot')[0]).html('<img src = \"' + images[slotOne-1] + '\">');",
"Set up all three slots like this, then click the \"Go\" button to play the slot machine."
],
"tests": [
"assert((code.match(/\\$\\s*?\\(\\s*?\\$\\s*?\\(\\s*?(?:'|\")\\s*?\\.slot\\s*?(?:'|\")\\s*?\\)\\[\\d\\]\\s*?\\)\\.html\\(\\s*?\\'\\$('.slot')[0] at least once.');",
"assert(code.match(/\\$\\s*?\\(\\s*?\\$\\s*?\\(\\s*?(?:'|\")\\s*?\\.slot\\s*?(?:'|\")\\s*?\\)\\[1\\]\\s*?\\)/gi), 'message: You should have used $('.slot')[1] at least once.');",
"assert(code.match(/\\$\\s*?\\(\\s*?\\$\\s*?\\(\\s*?(?:'|\")\\s*?\\.slot\\s*?(?:'|\")\\s*?\\)\\[2\\]\\s*?\\)/gi), 'message: You should have used $('.slot')[2] at least once.');",
"assert(code.match(/slotOne/gi) && code.match(/slotOne/gi).length >= 7, 'message: You should have used the slotOne value at least once.');",
"assert(code.match(/slotTwo/gi) && code.match(/slotTwo/gi).length >= 8, 'message: You should have used the slotTwo value at least once.');",
"assert(code.match(/slotThree/gi) && code.match(/slotThree/gi).length >= 7, 'message: You should have used the slotThree value at least once.');"
],
"challengeSeed": [
"fccss",
" function runSlots() {",
" var slotOne;",
" var slotTwo;",
" var slotThree;",
" ",
" var images = [\"http://i.imgur.com/9H17QFk.png\", \"http://i.imgur.com/9RmpXTy.png\", \"http://i.imgur.com/VJnmtt5.png\"];",
" ",
" slotOne = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotTwo = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" slotThree = Math.floor(Math.random() * (3 - 1 + 1)) + 1;",
" ",
" ",
" // Only change code below this line.",
" ",
" ",
" ",
" // Only change code above this line.",
" ",
" if (slotOne === slotTwo && slotTwo === slotThree) {",
" $('.logger').html(\"It's A Win\");",
" return null;",
" }",
" ",
" if(slotOne !== undefined && slotTwo !== undefined && slotThree !== undefined){",
" $(\".logger\").html(slotOne + \" \" + slotTwo + \" \" + slotThree);",
" }",
" ",
" $('.logger').append(\" Not A Win\");",
" ",
" return [slotOne, slotTwo, slotThree];",
" }",
"",
" $(document).ready(function() {",
" $('.go').click(function() {",
" runSlots();",
" });",
" });",
"fcces",
" ",
"",
"
",
"",
""
],
"type": "waypoint",
"challengeType": 0,
"nameEs": "Dale a tu máquina tragamonedas JavaScript algunas imágenes con estilo",
"descriptionEs": [
"Ahora añadamos algunas imágenes en nuestras casillas.",
"Ya hemos creado las imágenes por ti en una matriz llamada ",
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" images. Podemos utilizar diferentes índices para tomara cada una de estas. ",
"Aquí está como haríamos que la primera casilla muestre una imagen diferente dependiendo del número aleatorio que se genere:",
"$($('.slot')[0]).html('<img src = \"' + images[slotOne-1] + '\">');",
"Configura las tres casillas de manera análoga, a continuación, pulsa el botón \"Go\" para jugar con la máquina tragamonedas."
]
}
]
}