Array keys()

JavaScript Array keys() Examples

The keys() method returns a new Array Iterator object that contains the keys for each index in the array.

array.keys()

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JavaScript Array keys() Examples

Example 1

        let list = ["zero", "first", "second", "third"];
        let iterator = list.keys();

        for(let key of iterator) {
            console.log(key)
        }

output:

0
1
2
3

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Example 2

        let cars = ["bmw", "audi", "mercedes", "toyota"];
        console.log(cars.keys())

output:

Array Iterator

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Example 3

        let arr = ['a', 'b', 'c'];
        let iterator = arr.keys();
        let keyArray = [];

        for (let key of iterator) {
            keyArray.push(key);
        }
        console.log(keyArray);

output:

[0, 1, 2]

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Browser Support

Chrome	38
Edge	yes
Firefox	28
Internet Explorer	no
Opera	25
Safari	8
Android webview	yes
Chrome for Android	yes
Edge mobile	yes
Firefox for Android	28
Opera Android	yes