Filter filters out the elements specified by the function.

Map maps a slice of []T -> []U using the map function.

Reduce reduces the elements to a single one, by repeatedly applying a reducing function.

Retain retains only the elements specified by the function.

Reverse reverses the slice contents.

Sort sorts the sliceWrapper x given the provided less function.

SortStable sorts the sliceWrapper x using the provided less function, keeping equal elements in their original order.