Elixir Form Map

Key-value pairs

IEX > Map =%{:a = 1, 2 =: b}
%{2 + =: B,: A + 1}
IEX (+) > Map[:a]
1
IEX (> Map[2]
: b

Duplicate key retains last

IEX >%{:a = 1,: A + 2}
%{a:2}

Each keyword in the form is atomic and can be used as a keyword syntax

IEX (+) > map =%{a:1, b:2}
%{a:1, B:2}

Form pattern Matching

IEX (+) > map =%{a:1, b:2}
%{a:1, B:2}
IEX >%{:a + A} = Map
%{a:1, B:2}
IEX (> a)
1

Forms update and access keys for atomic classes

IEX (> Map.a)
1

IEX (+) >%{map | a:3}
%{a:3, B:2}

Note the blank or the error

Such as

IEX (+) >%{map | a:3}
* * (syntaxerror) Iex:25:keyword argument must be followed by space after:a:

Elixir Form Map