how to find character in string javascript code example

Example 1: find char in string javascript

var str = "Hello world, welcome to the universe.";

var n = str.indexOf("e");

Example 2: javascript indexof

//indexOf getting index of array element, returns -1 if not found
var colors=["red","green","blue"];
var pos=colors.indexOf("blue");//2

//indexOf getting index of sub string, returns -1 if not found
var str = "We got a poop cleanup on isle 4.";
var strPos = str.indexOf("poop");//9