JAVASCRIPT

string concatenation in js

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

string javascript concatenation

    var dest = new String("");
    var src = new String("aze");
    var ar = new Array();
    ...
    ar.push(src);
    ar.push(src);
    ...
    dest = ar.join("");

string javascript concatenation

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