[Edit]

JavaScript - String lastIndexOf() method example

1 contributors

2 contributions

0 discussions

0 points

Created by:

Vanessa-Drake

718

xxxxxxxxxx
 
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

Auto running

1. Documentation

Edit

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).
Result	The 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.