The entries() method returns a new iterator object that contains the [key, value] pairs for each element in the Map object in insertion order. In this particular case, this iterator object is also an iterable, so the for-of loop can be used. When the protocol [Symbol.iterator] is used, it returns a function that, when invoked, returns this iterator itself.
Map.prototype.entries()
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Syntax
entries()
Return value
A new Map iterator object.
Examples
Using entries()
let myMap = new Map() myMap.set('0', 'foo') myMap.set(1, 'bar') myMap.set({}, 'baz') let mapIter = myMap.entries() console.log(mapIter.next().value) // ["0", "foo"] console.log(mapIter.next().value) // [1, "bar"] console.log(mapIter.next().value) // [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 | |
entries |
38
|
12
|
20
|
No
|
25
|
8
|
38
|
38
|
20
|
25
|
8
|
3.0
|
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/entries
