CODEWITHSUNDEEP
erlang
user1000622
user1000622

Reputation: 529

List of tuples to map on Erlang

I have a list of tuples like this:[{key,val},{key2,val2}...] I want to be able to convert it into a map:

#{key=>val, key2=>val2 ......}

Upvotes: 3

Views: 3585

Answers (2)

7stud
7stud

Reputation: 48649

And if Hendri's solution is too simple for you, then you can do this:

-module(my).
-compile(export_all).

create_map(List_Of_Key_Val_Tuples) ->
    create_map(List_Of_Key_Val_Tuples, #{}).

create_map([], Acc) ->
    Acc;
create_map([{Key, Val} | Tail], Acc) ->
    create_map(Tail, Acc#{Key => Val}).

In the shell:

11> c(my).                                                                
my.erl:2: Warning: export_all flag enabled - all functions will be exported
{ok,my}

12> my:create_map([{a, 10}, {"hello", hi}, {fun(X) -> X+2 end, add_two}]).
#{a => 10,#Fun<erl_eval.6.99386804> => add_two,"hello" => hi}

Upvotes: 2

Hendri Tobing
Hendri Tobing

Reputation: 371

You can use the from_list function from the maps module:

maps:from_list(Yourlist).

Upvotes: 9

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