Integer.is_odd
You're seeing just the macro
is_odd, go back to Integer module for more information.
Determines if integer is odd.
Returns true if the given integer is an odd number,
otherwise it returns false.
Allowed in guard clauses.
Examples
iex> Integer.is_odd(5)
true
iex> Integer.is_odd(6)
false
iex> Integer.is_odd(-5)
true
iex> Integer.is_odd(0)
false