arr.concat

Let arr = [1, 2];

// merge arr with [3,4]
alert( arr.concat([3, 4])); // 1,2,3,4

// merge arr with [3,4] and [5,6]
alert( arr.concat([3, 4], [5, 6])); // 1,2,3,4,5,6

// merge arr with [3,4], then add values 5 and 6
alert( arr.concat([3, 4], 5, 6)); // 1,2,3,4,5,6

Syntax

Arr.concat(arg1, arg2...)