Function strLastIndexOf

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.

Example

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
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