add Remove and its tests

slice.go

@@ -261,6 +261,22 @@ func KeyBy[K comparable, V any](collection []V, iteratee func(V) K) map[K]V {
 	return result
 }
 
+// Remove removes an element from the slice or array.
+func Remove[T any](collection []T, i int) []T {
+	end := len(collection) - 1
+
+	if i > end {
+		panic("Index must exist in slice")
+	}
+
+	copy(collection[i:], collection[i+1:])
+
+	var zero T
+	collection[end] = zero
+
+	return collection[:end]
+}
+
 // Drop drops n elements from the beginning of a slice or array.
 func Drop[T any](collection []T, n int) []T {
 	if len(collection) <= n {

slice_test.go

@@ -278,6 +278,19 @@ func TestKeyBy(t *testing.T) {
 	is.Equal(result1, map[int]string{1: "a", 2: "aa", 3: "aaa"})
 }
 
+func TestRemove(t *testing.T) {
+	is := assert.New(t)
+
+	is.Equal([]int{1, 2, 3, 4}, Remove([]int{0, 1, 2, 3, 4}, 0))
+	is.Equal([]int{0, 2, 3, 4}, Remove([]int{0, 1, 2, 3, 4}, 1))
+	is.Equal([]int{0, 1, 3, 4}, Remove([]int{0, 1, 2, 3, 4}, 2))
+	is.Equal([]int{0, 1, 2, 4}, Remove([]int{0, 1, 2, 3, 4}, 3))
+	is.Equal([]int{0, 1, 2, 3}, Remove([]int{0, 1, 2, 3, 4}, 4))
+
+	is.PanicsWithValue("Index must exist in slice",
+		func() { is.Equal([]int{}, Remove([]int{0, 1, 2, 3, 4}, 5)) })
+}
+
 func TestDrop(t *testing.T) {
 	is := assert.New(t)