JavaScript Array.entries() Method Example

The JavaScript Array entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.

Syntax

array.entries()

This method returns a new Array iterator object.

Example 1: Simple Array.entries() Method Example

var array1 = ['a', 'b', 'c'];

var iterator1 = array1.entries();

console.log(iterator1.next().value);

console.log(iterator1.next().value);

Output:

[0, "a"]
[1, "b"]

Example 2: Iterating with index and element

const a = ['a', 'b', 'c'];

for (const [index, element] of a.entries())
  console.log(index, element);

Output:

[0, 'a']
[1, 'b']
[2, 'c']

Example 3: Using a for…of loop

var a = ['a', 'b', 'c'];
var iterator = a.entries();

for (let e of iterator) {
  console.log(e);
}

Output:

[0, 'a']
[1, 'b']
[2, 'c']