HTML check string does not end with code example

Example 1: javascript endswith

"Hello world".endsWith("world");//true
"Hello world".endsWith("Hello");//false

Example 2: 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 3: how to find out what a string ends with in javascript

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