Type Checking Utilities

Introduction

The lulu.types module has some functions for checking the “type” of a value.

If you have imported the module as

local types = require 'lulu.types'

Then you have access to the following methods:

Method	Description
`types.is_integer(val)`	Returns `true` if `val` is an integer.
`types.is_positive_integer(val)`	Returns `true` if `val` is a positive integer.
`types.is_negative_integer(val)`	Returns `true` if `val` is a negative integer.
`types.is_nan(val)`	Returns `true` if `val` a NaN.

These functions are primarily self-explanatory and mostly are simple one-liners.

For tables with a string field __name, this returns that string. Otherwise, it returns the output from the Lua standard type function.

The shorthand types(obj) is a synonym for types.type(obj).