Kernel.rem

You're seeing just the function rem, go back to Kernel module for more information.

rem(dividend, divisor)

rem(integer(), neg_integer() | pos_integer()) :: integer()

Computes the remainder of an integer division.

rem/2 uses truncated division, which means that the result will always have the sign of the dividend.

Raises an ArithmeticError exception if one of the arguments is not an integer, or when the divisor is 0.

Allowed in guard tests. Inlined by the compiler.

iex> rem(5, 2)
1
iex> rem(6, -4)
2