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);
}
Output
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);
Output
[ 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
