I have a key as a variable, I want to create a Map with a key :key1 or “key2” using one of the variables, but I’m unable to: iex(24)> a1 = :key1 :key1 iex(25)> a2 = "key2" "key2" iex(26)> %{a1: 123} %{a1: 123} iex(27)> %{:a1 => 123} %{a1: 123} iex(28)> %{^a2 => 123} ** (CompileError) iex:28: …

Don’t use the ^, just put a1 => 123 for it. :slight_smile:

You only use the pin operator ^ inside a match. It is used where you want to match on the value bound to the variable, and not bind a value to the variable. iex(1)> a = 5 5 iex(2)> a = 7 7 iex(3)> ^a = 7 7 iex(4)> ^a = 5 ** (MatchError) no match of right hand side value: 5

Elixir Programming Language Forum

Create a map having a key as a variable

Questions & Help Questions

OvermindDL1 April 28, 2017, 3:36pm 2

Don’t use the ^, just put a1 => 123 for it.