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JavaScript | array.entries() Method

The array.entries() is an inbuilt function in JavaScript which is used to get a new Array that contains the key and value pairs for each index of an array.
Syntax:

array.entries();

Return value:
It returns an array of index and values of the given array on which array.entries() function is going to work.

Browser Support:
Here 2nd column contain int values that are version of the corresponding browser.

Feature Basic support
Chrome 38
Edge Yes
Firefox 28
Internet Explorer No
Opera 25
Safari 8
Android webview Yes
Chrome for Android Yes
Edge mobile Yes
Firefox for Android 28
Opera Android Yes
iOS Safari 8

Examples:
Here array.entries() method in javaScript used to find out key and value pairs for each index in any given array.
Let’s see JavaScript program:

var array = ['geeksforgeeks', 'gfg', 'Jhon'];
var iterator = array.entries();
  
// expected output: Array [0, "geeksforgeeks"]
console.log(iterator.next().value);
  
// expected output: Array [1, "gfg"]
console.log(iterator.next().value);
  
// expected output: Array [2, "Jhon"]
console.log(iterator.next().value);

Output:

> Array [0, "geeksforgeeks"]
> Array [1, "gfg"]
> Array [2, "Jhon"]

Application:
Whenever we need to get key and value pair for each index in any array thet time we use array.entries() Method
Let’s see JavaScript program:

var array = ['geeksforgeeks', 'gfg', 'Jhon'];
var iterator = array.entries();
  
// printing key and value pair from the given
// array using for loop.
for (let e of iterator) {
  console.log(e);
}

Output:

> Array [0, "geeksforgeeks"]
> Array [1, "gfg"]
> Array [2, "Jhon"]


This article is attributed to GeeksforGeeks.org

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