The Javascript array.keys() method is used to return a new array iterator which contains the keys for each index in the given input array. Syntax:
array.keys()
Parameters: This method does not accept any parameters.
Return Values: It returns a new array iterator.
The below example illustrates the Array keys() method in JavaScript:
Example 1: In this example, we will see the use of Array.keys() method.
javascript
// Taking input as an array A// containing some elements.let A = [5, 6, 10];// array.keys() method is calledlet iterator = A.keys();// printing index array using the iteratorfor (let key of iterator) { console.log(key);} |
Output:
0 1 2
Example 2: In this example, we will see the use of Array.keys() method.
javascript
// Taking input as an array A// containing some elements.let A = ['gfg', 'neveropen', 'cse', 'geekpro'];// array.keys() method is calledlet iterator = A.keys();// printing index array using the iteratorfor (let key of iterator) { console.log(key);} |
Output:
0 1 2 3
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 keys() method are listed below:
- Google Chrome 38.0
- Microsoft Edge 12.0
- Mozilla Firefox 28.0
- Safari 8.0
- Opera 25.0
We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.
