JavaScript Array entries() Method

The entries() method in JavaScript is used to create an iterator that returns key/value pairs for each index in the array.

It allows iterating over arrays and accessing both the index and value of each element sequentially.

Syntax:

array.entries()

Parameters:

• This method does not accept any parameters.

Return value:

• Returns an array of indexes and values of the given array on which the Array.entries() method is going to work. 

Example 1: Iterating Array Entries in JavaScript

The code initializes an array languages and creates an iterator g using the entries() method. It then iterates over each key/value pair in the iterator using a for...of loop, logging each pair along with the string "geeks" to the console.

let languages = ["HTML", "CSS", "JavaScript", "ReactJS"];
let g = languages.entries();
for (x of g) {
    console.log("geeks",x);
}

geeks [ 0, 'HTML' ]
geeks [ 1, 'CSS' ]
geeks [ 2, 'JavaScript' ]
geeks [ 3, 'ReactJS' ]

Example 2: Iterating Over Array Entries in JavaScript

The code initializes an array fruits_names containing fruit names. It then creates an iterator fruits_array_iterator using the entries() method. Two calls to next().value are made on the iterator, logging the key/value pairs (index and corresponding element) to the console.

let fruits_names = ['apple', 'banana', 'mango'];
let fruits_array_iterator = fruits_names.entries();
console.log(fruits_array_iterator.next().value);
console.log(fruits_array_iterator.next().value);

[ 0, 'apple' ]
[ 1, 'banana' ]

We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.

Supported Browsers:

The browsers supported by the JavaScript Array entries() method are listed below:

• Google Chrome 38.0
• Microsoft Edge 12.0
• Mozilla Firefox 28.0
• Safari 8.0
• Opera 25.0