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JavaScript - String lastIndexOf() method example

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Created by:
Vanessa-Drake
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// ONLINE-RUNNER:browser;

const text = 'ABC ABC';

console.log(text.lastIndexOf('A')); // 4
console.log(text.lastIndexOf('B')); // 5
console.log(text.lastIndexOf('C')); // 6

console.log(text.lastIndexOf('X')); // -1

console.log(text.lastIndexOf('ABC')); // 4
console.log(text.lastIndexOf('XYZ')); // -1

console.log(text.lastIndexOf('B', 2)); // 1
console.log(text.lastIndexOf('B', 6)); // 5

1. Documentation

Syntax

String lastIndexOf(searchString)

String lastIndexOf(searchString, position)

Parameters

searchString - a string to be searched for within the string,

position - the method looks for the specified substring to the position less than or equal to the position (+Infinity by default).

ResultThe method returns the index of the last occurrence of searchString or -1 if not found.
Description

The lastIndexOf() method searches the entire calling string and returns the index of the last occurrence of the specified substring.

If the second argument is given (a number), the method returns the last occurrence of the specified substring at an index less than or equal to the specified number.

References

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

Alternative titles

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

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