Kernel.floor

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

floor(number)

View Source (since 1.8.0)

Specs

floor(number()) :: integer()

Returns the largest integer smaller than or equal to number.

If you want to perform floor operation on other decimal places, use Float.floor/2 instead.

Allowed in guard tests. Inlined by the compiler.