string togeter in js code example

Example 1: js concatenate strings

const str1 = 'Hello';
const str2 = 'World';

console.log(str1 + str2);
>> HelloWorld

console.log(str1 + ' ' + str2);
>> Hello World

Example 2: string javascript concatenation

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