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JavaScript - String indexOf() method example

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Created by:
Adnaan-Robin
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// ONLINE-RUNNER:browser;

const text = 'ABCABC';

console.log(text.indexOf('A')); // 0
console.log(text.indexOf('B')); // 1
console.log(text.indexOf('C')); // 2

console.log(text.indexOf('A', 3)); // 3
console.log(text.indexOf('B', 3)); // 4
console.log(text.indexOf('C', 3)); // 5

console.log(text.indexOf('BC'));    // 1
console.log(text.indexOf('BC', 3)); // 4

console.log(text.indexOf('123'));    // -1
console.log(text.indexOf('123', 2)); // -1

1. Documentation

Syntax

String indexOf(searchString)

String indexOf(searchString, position)

Parameters

searchString - a substring to search for.

position - a position to search from.

Result

The method returns the index of the first occurrence of searchString or -1 if not found.

If the method is called with no arguments returns 0.

Description

The method searches the entire calling string and returns the index of the first occurrence of the specified substring.

If the second argument is given, the method returns the first occurrence of the specified substring at an index greater than or equal to the specified number.

See also

  1. JavaScript - get index of item in array

  2. JavaScript - index of text in string after indicated position

References

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

Alternative titles

  1. JavaScript - String.indexOf() documentation with examples
  2. js - String indexOf() method documentation with examples
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JavaScript - String (documentation)

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