javascript get last word in string

1var hello = "Hello World";
2var lastCharOfHello=hello.slice(-1);//d

1var str = "Hello";
2var newString = str.substring(0, str.length - 1); //newString = Hell

1'abc'.slice(-2);

1// Get last n characters from string
2var name = 'Shareek';
3var new_str = name.substr(-5); // new_str = 'areek'

1function test(words) {
2
3var n = words.indexOf(" ");
4var res = words.substring(n+1,-1);
5return res;
6
7}

1// strips all punctuation and returns the last word of a string
2// hyphens (-) aren't stripped, add the hyphen to the regex to strip it as well
3function lastWord(words) {
4    let n = words.replace(/[\[\]?.,\/#!$%\^&\*;:{}=\\|_~()]/g, "").split(" ");
5    return n[n.length - 1];
6}