Array.addRange() ---- is add item to array

Array.addRange() ---- is add item to array
var a= [1,2];
var b= [3,4];
Array.addRange(a, b) ---- add b array to a
for(var i in a) ---- the result will be 1,2,3,4

Array.clone() --- is shallow copy : only copy the reference but the objects being referenced are not copied
array.push --- push the item on the top of the stack
array.pop -- pop method pops up the item at the top of the stack