128 lines
3.0 KiB
Markdown
128 lines
3.0 KiB
Markdown
---
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title: Arithmetic Operation
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localeTitle: Operación aritmética
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---
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JavaScript proporciona al usuario cinco operadores aritméticos: `+` , `-` , `*` , `/` y `%` . Los operadores son para suma, resta, multiplicación, división y resto respectivamente.
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## Adición
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**Sintaxis**
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`a + b`
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**Uso**
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```
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2 + 3 // returns 5
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true + 2 // interprets true as 1 and returns 3
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false + 5 // interprets false as 0 and returns 5
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true + "bar" // concatenates the boolean value and returns "truebar"
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5 + "foo" // concatenates the string and the number and returns "5foo"
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"foo" + "bar" // concatenates the strings and returns "foobar"
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```
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_Consejo:_ Hay un operador de [incremento](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Increment_() práctico que es un gran atajo cuando agregas números en 1.
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## Sustracción
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**Sintaxis**
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`a - b`
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**Uso**
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```
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2 - 3 // returns -1
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3 - 2 // returns 1
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false - 5 // interprets false as 0 and returns -5
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true + 3 // interprets true as 1 and returns 4
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5 + "foo" // returns NaN (Not a Number)
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```
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_Sugerencia:_ hay un operador de [reducción](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Decrement_(--) útil que es un gran atajo cuando estás restando números a 1.
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## Multiplicación
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**Sintaxis**
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`a * b`
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**Uso**
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```
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2 * 3 // returns 6
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3 * -2 // returns -6
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false * 5 // interprets false as 0 and returns 0
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true * 3 // interprets true as 1 and returns 3
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5 * "foo" // returns NaN (Not a Number)
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Infinity * 0 // returns NaN
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Infinity * Infinity // returns Infinity
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```
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## División
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**Sintaxis**
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`a / b`
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**Uso**
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```
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3 / 2 // returns 1.5
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3.0 / 2/0 // returns 1.5
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3 / 0 // returns Infinity
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3.0 / 0.0 // returns Infinity
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-3 / 0 // returns -Infinity
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false / 5 // interprets false as 0 and returns 0
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true / 2 // interprets true a 1 and returns 0.5
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5 + "foo" // returns NaN (Not a Number)
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Infinity / Infinity // returns NaN
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```
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## Recordatorio
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**Sintaxis**
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`a % b`
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**Uso**
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```
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3 % 2 // returns 1
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true % 5 // interprets true as 1 and returns 1
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false % 4 // interprets false as 0 and returns 0
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3 % "bar" // returns NaN
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```
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## Incremento
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**Sintaxis**
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`a++ or ++a`
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**Uso**
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```
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// Postfix
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x = 3; // declare a variable
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y = x++; // y = 4, x = 3
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// Prefix
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var a = 2;
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b = ++a; // a = 3, b = 3
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```
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## Decremento
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**Sintaxis**
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`a-- or --a`
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**Uso**
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```
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// Postfix
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x = 3; // declare a variable
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y = x--; // y = 3, x = 3
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// Prefix
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var a = 2;
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b = --a; // a = 1, b = 1
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```
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_!¡Importante!_ Como puede ver, no **puede** realizar ningún tipo de operaciones en `Infinity` .
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Fuente: El increíble [MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators) . |