Number.prototype.valueOf()

O método valueOf() retorna o valor primitivo contido no objeto Number.

Sintaxe

numObj.valueOf()

Valor retornado

Um número representando o valor primitivo do objeto Number.

Descrição

Este método normalmente é invocado internamente pelo JavaScript e não explicitamente em um código web.

Exemplos

Utilizando valueOf

var numObj = new Number(10);
console.log(typeof numObj); // object

var num = numObj.valueOf();
console.log(num);           // 10
console.log(typeof num);    // number

Specifications

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Padrão Definição inicial. Implementada no JavaScript 1.1.
ECMAScript 5.1 (ECMA-262)
The definition of 'Number.prototype.valueOf' in that specification.		 Padrão  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.prototype.valueOf' in that specification.		 Padrão  
ECMAScript Latest Draft (ECMA-262)
The definition of 'Number.prototype.valueOf' in that specification.		 Rascunho  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
valueOfChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

See also

Última modificação:

, by MDN contributors
Tópicos relacionados
  1. Standard built-in objects
  2. Number
  3. Propriedades
    1. Number.EPSILON [Traduzir]
    2. Number.MAX_SAFE_INTEGER [Traduzir]
    3. Number.MAX_VALUE [Traduzir]
    4. Number.MIN_SAFE_INTEGER [Traduzir]
    5. Number.MIN_VALUE [Traduzir]
    6. Number.NEGATIVE_INFINITY [Traduzir]
    7. Number.NaN
    8. Number.POSITIVE_INFINITY
    9. Number.prototype
  4. Métodos
    1. Number.isFinite()
    2. Number.isInteger()
    3. Number.isNaN()
    4. Number.isSafeInteger() [Traduzir]
    5. Number.parseFloat()
    6. Number.parseInt() [Traduzir]
    7. Number.prototype.toExponential()
    8. Number.prototype.toFixed()
    9. Number.prototype.toLocaleString()
    10. Number.prototype.toPrecision()
    11. Number.prototype.toSource()
    12. Number.prototype.toString()
    13. Number.prototype.valueOf()
    14. Number.toInteger() [Traduzir]
  5. Herança:
  6. Function
  7. Propriedades
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  8. Métodos
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  9. Object
  10. Propriedades
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__ [Traduzir]
    3. Object.prototype.__parent__ [Traduzir]
    4. Object.prototype.__proto__
    5. Object.prototype.constructor
  11. Métodos
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__() [Traduzir]
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__() [Traduzir]
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable() [Traduzir]
    8. Object.prototype.toLocaleString() [Traduzir]
    9. Object.prototype.toSource() [Traduzir]
    10. Object.prototype.toString()
    11. Object.prototype.unwatch() [Traduzir]
    12. Object.prototype.valueOf()
    13. Object.prototype.watch() [Traduzir]
    14. Object.setPrototypeOf()