appending string in javascript code example

Example 1: string concatenation in js

var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);
console.log(res);

Example 2: append string js

var s = "1"
s += "2"

Example 3: concat no and string in javascript

['Hello', ' ', 'World'].join(''); // 'Hello World'

Example 4: javascript add to string

var s = 'hell'
s = s + 'o'