What are the differences between Array.pop() and Array.shift() in JavaScript?
Gable E

In JavaScript,Array.pop() andArray.shift() are both methods used to modify the contents of an array by removing elements, but they operate on different ends of the array. Here are the main differences betweenArray.pop() andArray.shift(): 1. Removal Position: -Array.pop(): - Thepop() method removes the last element from the end of the array. - It modifies the original array and returns the removed element. -Array.shift(): - Theshift() method removes the first element from the beginning of the array. - It modifies the original array and returns the removed element. 2. Modified Array: -Array.pop(): -pop() removes the last element from the array, reducing its length by one. - The modified array will have a different length compared to the original array. -Array.shift(): -shift() removes the first element from the array, shifting all other elements down by one index. - The modified array will also have a different length compared to the original array. 3. Return Value: -Array.pop(): -pop() returns the removed element from the end of the array. - If the array is empty, it returnsundefined. -Array.shift(): -shift() returns the removed element from the beginning of the array. - If the array is empty, it returnsundefined. 4. Time Complexity: -Array.pop(): - The time complexity ofpop() is O(1), as it only needs to remove the last element. -Array.shift(): - The time complexity ofshift() is O(n), where n is the length of the array, as it needs to shift all other elements down by one index. Usage example:

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const array = [1, 2, 3, 4, 5];

const poppedElement = array.pop();
console.log(poppedElement); // 5
console.log(array); // [1, 2, 3, 4]

const shiftedElement = array.shift();
console.log(shiftedElement); // 1
console.log(array); // [2, 3, 4]

In this example,array.pop() removes the last element5 from thearray and returns it.array.shift() then removes the first element1 from the modifiedarray and returns it. The resulting arrays contain the remaining elements after the removal. Choose the appropriate method based on your specific use case. If you need to remove elements from the end of the array, useArray.pop(). If you need to remove elements from the beginning of the array, useArray.shift().

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