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(-1); // c

1function test(words) {
2    var n = words.split(" ");
3    return n[n.length - 1];
4}

1'abc'.slice(-2);

1var lastChar = myString[myString.length -1];