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JavaScript - get index of item in array

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Created by:
Vanessa-Drake
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In this article, we would like to show you how to get the index of item in an array in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const numbers = [1, 2, 3];

const result = numbers.indexOf(2);
console.log(result);  // 1

 

Practical example

In this example, we use indexOf() method to find the index of the specific item in the numbers array.

// ONLINE-RUNNER:browser;

const numbers = [1, 2, 3];

console.log(numbers.indexOf(1));  // 0
console.log(numbers.indexOf(2));  // 1
console.log(numbers.indexOf(5));  // -1

Example with array of strings:

// ONLINE-RUNNER:browser;

const letters = ['A', 'B', 'C'];

console.log(letters.indexOf('A'));  // 0
console.log(letters.indexOf('B'));  // 1
console.log(letters.indexOf('X'));  // -1

Note:

If the specified value is not present in the array, the indexOf() method returns -1.

References

  1. Array.prototype.indexOf() - JavaScript | MDN
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