append string 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 concatenation js

var aString="";
aString.concat(value1, value2, ... value_n);

Example 3: append string js

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