javascript check if string ends with

"Hello world".endsWith("world");//true
"Hello world".endsWith("Hello");//falsefunction endsWith(str, suffix) {
    return str.indexOf(suffix, str.length - suffix.length) !== -1;
}

endsWith("hello young man","man");//true
endsWith("hello young man","boy");//false
function isJS(path) {
	return /jsx?$/.test(path)
}