We can remove elements from an existing array.
We use the pop
and shift
methods to remove elements from the beginning or end of the array.
Both methods return the item they removed.
We can use these methods to process the items in an array one-by-one.
Pop from the End
The pop
method removes an element from end of the array and returns it:
const arr = [1, 2, 3, 4];
const lastItem = arr.pop();
console.log(arr);
console.log(lastItem);
Shift from the Start
The shift
method removes an element from the start of an array and returns it:
const arr = [1, 2, 3, 4];
const firstItem = arr.shift();
console.log(arr);
console.log(firstItem);
Array Length
Both of these methods change the number of elements in the array.
The array's length
property will automatically update:
const arr = [1, 2, 3];
console.log(arr.length); // 3
arr.pop();
console.log(arr); // [1, 2]
console.log(arr.length); // 2