Pop Method

Pop Method

The pop method removes the last item from the array and returns its value. This method helps manage the array's contents by allowing us to remove the most recently added element.

How It Works

1. Initialization: Create an instance of the MyArray class.
2. Adding Elements: Use the push method to add elements.
3. Removing an Element: Call the pop method to remove the last element from the array.

warning

Ensure the array is not empty before calling pop, as it may lead to unexpected results.

Implementation Logic

The pop method identifies the last item in the array using the current length minus one. It then deletes this item from the data object, decrements the array length, and returns the removed item.

Code Example

class MyArray {
  constructor() {
    this.length = 0;
    this.data = {};
  }

  /**
   * Removes the last element from the array and returns it.
   * @returns {*} - The removed element.
   */
  pop() {
    const lastItem = this.data[this.length - 1];
    delete this.data[this.length - 1];
    this.length--;
    return lastItem;
  }
}

const myArray = new MyArray();
myArray.push("apple"); // Adding "apple" to the array
myArray.push("banana"); // Adding "banana" to the array
console.log(myArray.pop()); // Removing and displaying the last element
console.log(myArray); // Displaying the array's contents

Output

"banana"
MyArray { length: 1, data: { '0': 'apple' } }