Integer.is_even
You're seeing just the macro
is_even, go back to Integer module for more information.
Determines if an integer is even.
Returns true if the given integer is an even number,
otherwise it returns false.
Allowed in guard clauses.
Examples
iex> Integer.is_even(10)
true
iex> Integer.is_even(5)
false
iex> Integer.is_even(-10)
true
iex> Integer.is_even(0)
true