String Operation In Javascript

Declare a string variable:

var desc = "Helping others who want to help themself";

To get the length of the string, use:
elem.innerHTML = desc.length;

output> 40

elem.innerHTML = desc.toUpperCase();

output> HELPING OTHERS WHO WANT TO HELP THEMSELF

elem.innerHTML = desc.toLowerCase();

output> helping others who want to help themself

elem.innerHTML = desc.charAt(0);    // char at first index.

output> H

elem.innerHTML = desc.charAt(desc.length-1)); // the last char

output> f

var zero = "indonesia";

var one = " sunday";

var two = " friday";

elem.innerHTML = zero.concat(one, two);    // new string

output> indonesia sunday friday

var hello = "Hello World";

elem.innerHTML = hello.indexOf("Wor");

output> 6

elem.innerHTML = hello.indexOf("WORLD");    // nothing

output> -1

elem.innerHTML = hello.indexOf("o");

output> 4

elem.innerHTML = hello.lastIndexOf("o");

output> 7

var hello = "Hello World";

elem.innerHTML = hello.slice(1);

output> ello World

elem.innerHTML = hello.slice(hello.indexOf("W"));

output> World

var abc = "ABCDE";

elem.innerHTML = hello.substr(2,2);

output> CD

String Operation In Javascript