How is the process of removing elements from the beginning and end of an array carried out?

Removing elements from the beginning and end of an array (slice) in Go is done by creating a new slice, which is a 'view' (slice) of the original. This does not delete elements from the original array but creates a new reference to its part.

To remove from the beginning:

// Remove the first element
arr := []int{1, 2, 3, 4, 5}
newArr := arr[1:]
// newArr is now {2, 3, 4, 5}

To remove from the end:

// Remove the last element
arr := []int{1, 2, 3, 4, 5}
newArr := arr[:len(arr)-1]
// newArr is now {1, 2, 3, 4}

Removing multiple elements from the beginning:

// Remove the first N elements
arr := []int{1, 2, 3, 4, 5}
n := 2
if len(arr) >= n {
    newArr := arr[n:]
    // newArr is now {3, 4, 5}
}

Removing multiple elements from the end:

// Remove the last N elements
arr := []int{1, 2, 3, 4, 5}
n := 2
if len(arr) >= n {
    newArr := arr[:len(arr)-n]
    // newArr is now {1, 2, 3}
}

It is important to remember that these operations do not modify the original array but create a new slice that references the underlying array. If the underlying array becomes inaccessible after all slices referencing it are also inaccessible, the garbage collector will free the memory.

Using append for removal: Elements can also be removed using append combined with slices, especially if you need to maintain performance when removing from the middle, but for the beginning and end, slices are more idiomatic and clear.