javascript ensure string 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: how to find out what a string ends with in javascript

function isJS(path) {
	return /jsx?$/.test(path)
}