freeCodeCamp/testing-objects-for-properties.english.md at e0e633462807b69e08dfb5cc7171fcc9294b613f

Kalyanasundaram 8b0cbd6f83

Modify tests for testing objects for properties challenge (#38414 )

* Stronger test cases for testing objects for properties

Change function signature to take in a custom object to be tested

* YML formatting mistake

* Yaml no space in string

* Small one more fix - most likely final

* REmove double space in return

* Update instruction Section

2020-03-24 22:09:57 -07:00

2.7 KiB

Raw Blame History

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
567af2437cbaa8c51670a16c	Testing Objects for Properties	1	https://scrimba.com/c/cm8Q7Ua	18324

Description

Sometimes it is useful to check if the property of a given object exists or not. We can use the .hasOwnProperty(propname) method of objects to determine if that object has the given property name. .hasOwnProperty() returns true or false if the property is found or not. Example

var myObj = {
  top: "hat",
  bottom: "pants"
};
myObj.hasOwnProperty("top");    // true
myObj.hasOwnProperty("middle"); // false

Instructions

Modify the function checkObj to test if an object passed to the function (obj) contains a specific property (checkProp). If the property is found, return that property's value. If not, return "Not Found".

Tests

tests:
  - text: '<code>checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "gift")</code> should return <code>"pony"</code>.'
    testString: 'assert(checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "gift") === "pony");'
  - text: '<code>checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "pet")</code> should return <code>"kitten"</code>.'
    testString: 'assert(checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "pet") === "kitten");'
  - text: '<code>checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "house")</code> should return <code>"Not Found"</code>.'
    testString: 'assert(checkObj({gift: "pony", pet: "kitten", bed: "sleigh"}, "house") === "Not Found");'
  - text: '<code>checkObj({city: "Seattle"}, "city")</code> should return <code>"Seattle"</code>.'
    testString: 'assert(checkObj({city: "Seattle"}, "city") === "Seattle");'
  - text: '<code>checkObj({city: "Seattle"}, "district")</code> should return <code>"Not Found"</code>.'
    testString: 'assert(checkObj({city: "Seattle"}, "district") === "Not Found");'

Challenge Seed

// Setup
var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};

function checkObj(obj, checkProp) {
  // Only change code below this line
  return "Change Me!";
  // Only change code above this line
}

checkObj(myObj, "gift");

Solution

var myObj = {
  gift: "pony",
  pet: "kitten",
  bed: "sleigh"
};
function checkObj(obj, checkProp) {
  if(obj.hasOwnProperty(checkProp)) {
    return obj[checkProp];
  } else {
    return "Not Found";
  }
}

2.7 KiB Raw Blame History