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Adds one or more elements to the end of an array and returns the new length of the array. Complexity: O(1) amortized.

Removes the last element from an array and returns that element. Complexity: O(1).

Removes the first element from an array and returns that removed element. Complexity: O(n) as it may require shifting all other elements.

Adds one or more elements to the beginning of an array and returns the new length. Complexity: O(n) as it may require shifting all other elements.

Returns a shallow copy of a portion of an array into a new array object. Complexity: O(n), where n is the number of elements in the selected range.

Changes the contents of an array by removing or replacing existing elements and/or adding new elements in place. Complexity: O(n), due to the need to shift elements.

Used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array. Complexity: O(n), where n is the total number of elements in the combined arrays.

Returns the first index at which a given element can be found in the array, or -1 if it is not present. Complexity: O(n), where n is the array length.

Sorts the elements of an array in place and returns the array. The default sort order is according to string Unicode code points. Complexity: O(n log n), on average, depending on the implementation.