push() & concat()

eg.

var arr = [];
arr.push(1);
arr.push([2, 3]);
arr.push(4, 5);
arr = arr.concat(6);
arr = arr.concat([7, 8]);
arr = arr.concat(9, 10);

for(var i=0; i<arr.length; i++){
    console.log(arr[i]);
}