JavaScript - indexOf() method from position

In this article, we would like to show you how to use indexOf() method starting from a specific position in JavaScript.

The indexOf() method with specified second parameter - position, returns the index of the first occurrence of the specified string at a position greater than or equal to position (which is 0 by default).

Runnable example:

xxxxxxxxxx

// index:     0 2  5

//            | |  |

const text = 'This is example text...';

const result = text.indexOf('is', 3);

​

console.log(result); // 5

Output:

xxxxxxxxxx

5

For comparison, if we had not specified the position parameter, the method would return the index of the first 'is' occurrence, which is 2.

xxxxxxxxxx

// index:     0 2  5

//            | |  |

const text = 'This is example text...';

const result = text.indexOf('is');

​

console.log(result); // 2

Output:

xxxxxxxxxx

2

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