Use .shift to remove the first item of an array.
Further .pop is used to remove the last item from an array.
Use .splice() to remove a series of elements from an array. .splice() accepts two parameters, the starting index, and an optional number of elements to delete. If the second parameter is left out .splice() will remove all elements from the starting index through the end of the array.
The return of array.splice() is a new array containing the removed elements. For the example above, the return would be:
Use delete to remove item from array without changing the length of array:
Assigning value to length of array changes the length to given value. If new value is less than array length items will be removed from the end of value.