I've got the following Elixir code:

defmodule Envvar do
 def exists?(env) do :os.getenv(env) != false end
 def get(env) do 
 if exists?(env) do
 {env, :os.getenv(env)}
 else 
 {env, nil}
 end 
 end
end

Two things:

1. Am I using the ? correctly here? I'm assuming that any predicate function should have the ? on the end of the name by convention.
2. Is there a way to code the get function as a pattern match rather than a if/`else? I'm asking here because I'm guessing that a pattern match would be more idiomatic Elixir code.

I've got the following Elixir code:

defmodule Envvar do
 def exists?(env) do :os.getenv(env) != false end
 def get(env) do 
 if exists?(env) do
 {env, :os.getenv(env)}
 else 
 {env, nil}
 end 
 end
end

Two things:

1. Am I using the ? correctly here? I'm assuming that any predicate function should have the ? on the end of the name by convention.
2. Is there a way to code the get function as a pattern match rather than a if/else? I'm asking here because I'm guessing that a pattern match would be more idiomatic Elixir code.