➖ Array.prototype.pop() Polyfill

The pop() method removes the last element from an array and returns that element.

✅ Implementation

Array.prototype.customPop = function () {
    if (this.length === 0) return undefined; // Return undefined if the array is empty

    const lastElement = this[this.length - 1]; // Store the last element
    this.length = this.length - 1; // Decrease the length of the array

    return lastElement; // Return the removed element
};

// Example usage:
const array = [1, 2, 3];
const popped = array.customPop();

console.log(popped); // Output: 3
console.log(array);  // Output: [1, 2]
console.log([].customPop()); // Output: undefined (empty array case)

How It Works

1. Handles an empty array
   • If this.length === 0, it returns undefined, just like pop().
2. Stores the last element
   • Saves this[this.length - 1] before modifying the array.
3. Modifies the array in place
   • Reduces the length of the array by 1, effectively removing the last element.
4. Returns the removed element
   • Mimics pop() behavior by returning the removed item.

Edge Cases Handled

✔ Works on normal arrays

✔ Works on empty arrays ([].customPop() → undefined)

✔ Modifies the original array in place

✔ Returns the last element as expected

This implementation is clean, efficient, and follows Array.prototype.pop exactly.