In Elixir, if executes a do…end block unless the given condition is false or nil as you know.

iex(1)> if true, do: IO.puts("ok")
ok
:ok
iex(2)> if 3, do: IO.puts("ok")
ok
:ok
iex(3)> if false, do: IO.puts("ok")
nil
iex(4)> if nil, do: IO.puts("ok")
nil
iex(5)> if "ok", do: IO.puts("ok")
ok
:ok

I’d like to know how to check whether the given argument for if is true. The only way I thought out for checking it is below.

if a == true, do: IO.puts("ok")

I feel a == true is somehow weird, are there any better ways to check true?