maps
maps
Module
maps
Module summary
Maps Processing Functions
Description
This module contains functions for maps processing.
Exports
filter(Pred, Map1) -> Map2
Types:
Pred = fun((Key, Value) -> boolean())
Key = Value = term()
Map1 = Map2 = #{}
Returns a map Map2 for which predicate Pred holds true in Map1.
The call will fail with a {badmap,Map} exception if Map1 is not a map or with badarg if Pred is not a function of arity 2.
Example:
> M = #{a => 2, b => 3, c=> 4, "a" => 1, "b" => 2, "c" => 4},
Pred = fun(K,V) -> is_atom(K) andalso (V rem 2) =:= 0 end
