how to add a function to the array in js code example

Example 1: 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'

Example 2: how can add to array javascript

var fruits = ["Banana", "Orange", "Apple", "Mango"];

f
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fruits.push("Kiwi");