js check if string starts and ends with code example

Example 1: javascript check if string ends with

function endsWith(str, suffix) {
    return str.indexOf(suffix, str.length - suffix.length) !== -1;
}

endsWith("hello young man","man");//true
endsWith("hello young man","boy");//false

Example 2: check if string starts with javascript

var str = "Hello world, welcome to the universe.";
var n = str.startsWith("Hello");//true