how to make for each using length in javascript code example

Example 1: javascript string lentrh

var myString = "string test";
var stringLength = myString.length;

console.log(stringLength); // Will return 11 because myString 
// 							  is 11 characters long...

Example 2: javascript length

var colors = ["Red", "Orange", "Blue", "Green"];
var colorsLength=colors.length;//4 is colors array length 

var str = "bug";
var strLength=str.length;//3 is the number of characters in bug