CODEWITHSUNDEEP
elixir
Daniel C
Daniel C

Reputation: 1362

Is there a way to iterate over all arguments passed to a function in Elixir?

I know that one can pass a single list to a function and then iterate over that. However, I prefer to have functions with a more explicit signature. So what I am really looking to know is whether Elixir has anything that is equivalent to the arguments object in Javascript.

As far as I can tell the answer is no. The closest I have seen to a discussion of this topic was in the answer to this question.

The reason I am looking for this feature, is that I have several times found myself applying the same conversion to multiple arguments and it is a bit tedious. Could this be implemented via a macro, perhaps?

Upvotes: 9

Views: 2625

Answers (1)

Chris McCord
Chris McCord

Reputation: 8110

This is possible, but I would rarely use it:

calling binding() at the top of the function will give you a keyword list of the bindings in scope and their values, which would be the arguments if you called it as the first line of your function, i.e.:

iex(6)> defmodule Mod do
...(6)>   def args(a, b, c) do
...(6)>     for {arg, val} <- binding() do
...(6)>       IO.puts "#{arg} = #{inspect val}"
...(6)>     end
...(6)>   end
...(6)> end


iex(7)> Mod.args(1,2,3)
a = 1
b = 2
c = 3
[:ok, :ok, :ok]

Upvotes: 16

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