Apply:
The apply() method calls a function with a given this value, and arguments provided as an array.

ex :1
var numbers = [5, 6, 2, 3, 7];
var max = Math.max.apply(null, numbers);
console.log("Using apply(): "+max); // expected output: 7


// Example - 02
var array = ['a', 'b'];
var elements = [0, 1, 2];
array.push.apply(array, elements);
console.info("Using apply(): "+array); // ["a", "b", 0, 1, 2]