Copy returns a shallow copy of the given map.

Filter returns a shallow copy of the given map with items that satisfy the predicate f.

Keys returns the slice of keys for the given map.

Merge returns a new map that contains all the elements of the given maps.

RandKeys returns the slice of keys for the given map, sorted using given sorting function.

Select returns a shallow copy of the given map with items that satisfy the predicate f and will fail when key is not present.

Slice returns map values as a slice.

SortKeys returns the slice of keys for the given map, sorted using given sorting function.