JavaScript Array entries() Method

JavaScript Array entries() Method returns an Array Iterator object with key/value pairs.

The entries() method does not change the original array.

Syntax

array.entries()  

Parameters

It does not have any parameters.

Return Value

It returns the newly created array iterator object.

The iterator object represents each element of the array with keys assigned to them. A key represents the index number carrying an item as its value.

Examples

const languages = ["JavaScript", "Java", "C", "C++", "Python", "Lua"];
let iterator = languages.entries();

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

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

const iterator1 = array1.entries();

console.log(iterator1.next().value);
// expected output: Array [0, "a"]

console.log(iterator1.next().value);
// expected output: Array [1, "b"]

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

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

// 0 'a'
// 1 'b'
// 2 'c'

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

for (let e of iterator) {
  console.log(e);
}
// [0, 'a']
// [1, 'b']
// [2, 'c']