I volontari di MDN non hanno ancora tradotto questo articolo in Italiano. Unisciti a noi e traducilo tu stesso.
Puoi anche consultare l’articolo in English (US).

The return() method returns the given value and finishes the generator.

Syntax

gen.return(value)

Parameters

value
The value to return.

Return value

The value that is given as an argument.

Examples

Using return()

The following example shows a simple generator and the return method.

function* gen() { 
  yield 1;
  yield 2;
  yield 3;
}

var g = gen();

g.next();        // { value: 1, done: false }
g.return('foo'); // { value: "foo", done: true }
g.next();        // { value: undefined, done: true }

If return(value) is called on a generator that is already in "completed" state, the generator will remain in "completed" state. If no argument is provided, the return object is the same as if .next(). If an argument is provided, it will be set to the value of the value property of the returned object.

function* gen() {
  yield 1;
  yield 2;
  yield 3;
}

var g = gen();
g.next(); // { value: 1, done: false }
g.next(); // { value: 2, done: false }
g.next(); // { value: 3, done: false }
g.next(); // { value: undefined, done: true }
g.return(); // { value: undefined, done: true }
g.return(1); // { value: 1, done: true }

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Generator.prototype.return' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Generator.prototype.return' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
Basic supportChrome Full support 50Edge Full support 13Firefox Full support 38IE No support NoOpera Full support 37Safari Full support 10WebView Android ? Chrome Android Full support 50Edge Mobile Full support 13Firefox Android Full support 38Opera Android Full support YesSafari iOS Full support 10Samsung Internet Android Full support 5.0nodejs Full support 6.0.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Tag del documento e collaboratori

Hanno collaborato alla realizzazione di questa pagina: schlagi123, fscholz, jameshkramer, rwaldron, foolifish07, nmve, kdex, Dennis.li, David_Gilbertson, eduardoboucas, panhezeng
Ultima modifica di: schlagi123,