push something to a specific array inside an array js code example

Example 1: js array add element

array.push(element)

Example 2: js add function to array

//create an new function that can be used by any array
Array.prototype.second = function() {
  return this[1];
};

var myArray = ["item1","item2","item3"];
console.log(myArray.second());//returns 'item2'