javascript appending string code example

Example 1: concat no and string in javascript

['Hello', ' ', 'World'].join(''); // 'Hello World'

Example 2: how the concat function works javascript

var arr = [1, 2, 3, 4];
var arr2 = [5, 6, 7, 8];

const both = arr.concat(arr2);

console.log(both);
//[1, 2, 3, 4, 5, 6, 7, 8]