How do you check for the type of variable in Elixir

Question

In Elixir how do you check for type such as in Python:

>>> a = \"test\"
>>> type(a)

>>> b =10
>>> type(b         


        

Answer 1

Another approach is to use pattern matching. Say you're using Timex, which uses a %DateTime{} struct, and you want to see if an element is one. You can find a match using pattern matching in the method.

def is_a_datetime?(%DateTime{}) do
  true
end

def is_a_datetime?(_) do
  false
end

Answer 2

I came across a situation need to check the parameter need to be certain type. Maybe can active a better way.

Like this:

@required [{"body", "binary"},{"fee", "integer"}, ...]
defp match_desire?({value, type}) do
  apply(Kernel, :"is_#{type}", [value])
end

Usage:

Enum.map(@required, &(match_desire?/1))