Delete is a thread-safe function to delete the key-value pair with the specified key from the given map.

Filter is a thread-safe function that returns a new map containing only the elements in the input map m for which the specified function f is true.

Get is a thread-safe function to get a value by key k in a map m.

GetOK is a thread-safe function to get a value by key k in a map m.

Invert is a thread-safe function that returns a new map were keys and values are swapped.

Len is a thread-safe function to get the length of a map m.

Map is a thread-safe function that returns a new map that contains each of the elements of the input map m mutated by the specified function.

Reduce is a thread-safe function that applies the reducing function f to each element of the input map m, and returns the value of the last call to f.

Set is a thread-safe function to assign a value v to a key k in a map m.