The initial value of the @@iterator
property is the same function object as the initial value of the entries
method.
Map.prototype[@@iterator]()
Try it
Syntax
myMap[Symbol.iterator]
Return value
The map iterator function, which is the entries()
function by default.
Examples
Using [@@iterator]()
const myMap = new Map() myMap.set('0', 'foo') myMap.set(1, 'bar') myMap.set({}, 'baz') const mapIter = myMap[Symbol.iterator]() console.log(mapIter.next().value) // ["0", "foo"] console.log(mapIter.next().value) // [1, "bar"] console.log(mapIter.next().value) // [Object, "baz"]
Using [@@iterator]() with for..of
const myMap = new Map() myMap.set('0', 'foo') myMap.set(1, 'bar') myMap.set({}, 'baz') for (const entry of myMap) { console.log(entry) } // ["0", "foo"] // [1, "bar"] // [{}, "baz"] for (const [key, value] of myMap) { console.log(`${key}: ${value}`) } // 0: foo // 1: bar // [Object]: baz
Specifications
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
@@iterator |
43
|
12
|
36
27-36
A placeholder property named
@@iterator is used.
17-27
A placeholder property named
iterator is used.
|
No
|
30
|
10
|
43
|
43
|
36
27-36
A placeholder property named
@@iterator is used.
17-27
A placeholder property named
iterator is used.
|
30
|
10
|
4.0
|
1.0
|
0.12.0
|
See also
© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/@@iterator