WeakMap.prototype.get()

O método get() retorna um elemento especificado de um objeto WeakMap.

Sintaxe

wm.get(chave);

Parâmetros

chave
Obrigatório. A chave do elemento a ser retornado pelo objeto WeakMap.

Valor de retorno

O elemento associado à chave especificada no objeto WeakMap. Se a chave não for encontrada, retorna-se undefined.

Exemplos

Utilizando o método get 

var wm = new WeakMap();
wm.set(window, 'foo');

wm.get(window); // Retorna "foo".
wm.get('baz');  // Returna undefined.

Especificações

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'WeakMap.prototype.get' in that specification.
Padrão Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'WeakMap.prototype.get' in that specification.
Rascunho  

Compatibilidade dos navegadores

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
getChrome Full support 36Edge Full support 12Firefox Full support 6
Notes
Full support 6
Notes
Notes Prior to Firefox 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.
IE Full support 11Opera Full support 23Safari Full support 8WebView Android Full support 37Chrome Android Full support 36Firefox Android Full support 6
Notes
Full support 6
Notes
Notes Prior to Firefox 38, this method threw a TypeError when the key parameter was not an object. However, the ES2015 specification specifies to return undefined instead. Furthermore, WeakMap.prototype.get accepted an optional second argument as a fallback value, which is not part of the standard. Both non-standard behaviors are removed in version 38 and higher.
Opera Android Full support 24Safari iOS Full support 8Samsung Internet Android Full support Yesnodejs Full support 0.12
Full support 0.12
Full support 0.10
Disabled
Disabled From version 0.10: this feature is behind the --harmony runtime flag.

Legend

Full support  
Full support
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

Ver também