javascript add string 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: javascript add to string

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

Example 4: string javascript concatenation

var dest = new String("");
    var src = new String("aze");
    ...
    dest += src + src + src + src + src;