The value to be checked for the seeach string
The substring to search for in the value
Optionalposition: numberThe starting position to search from
strLastIndexOf('canal', 'a'); // returns 3
strLastIndexOf('canal', 'a', 2); // returns 1
strLastIndexOf('canal', 'a', 0); // returns -1
strLastIndexOf('canal', 'x'); // returns -1
strLastIndexOf('canal', 'c', -5); // returns 0
strLastIndexOf('canal', 'c', 0); // returns 0
strLastIndexOf('canal', ''); // returns 5
strLastIndexOf('canal', '', 2); // returns 2
The
strLastIndexOf()method, given two arguments: the string and a substring to search for, searches the entire calling string, and returns the index of the last occurrence of the specified substring. Given a third argument: a number, the method returns the last occurrence of the specified substring at an index less than or equal to the specified number.