How to use String lastIndexOf() to search from the end of a string in Javascript

Search from the end

lastIndexOf() searches a string and return the position. It returns -1 if the substring isn't found. lastIndexOf() method does the search from the end of the string.

var stringValue = "hello world"; 
console.log(stringValue.lastIndexOf("o")); //7 

The code above generates the following result.

Start from middle

An optional second argument tells where to start with.

var stringValue = "hello world"; 
console.log(stringValue.lastIndexOf("o", 6)); //4 

The code above generates the following result.