how to add to string javascript code example

Example 1: how to concatenate strings javascript

var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);
// does not change the existing strings, but
// returns a new string containing the text
// of the joined strings.

Example 2: how to concatenate strings and variables in javascript

const helloName = name => `Hello ${name}!`

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'