type

type; Function
	Syntax; type( variable : any; )
Returns	string type
API	Base globals
Source	CC:Tweaked

Returns a string representing the type of the given variable.

ExamplePrint various types

Prints the types of several variables

Code

local tbl = {}
local str = ""
local func = function() end
local thread = coroutine.create( function() end )
local bool = true
local number = 1
local nothing = nil
print(type(tbl))
print(type(str))
print(type(func))
print(type(thread))
print(type(bool))
print(type(number))
print(type(nothing))

Output

table
string
function
thread
boolean
number
nil

ExampleValidate an argument

Throws an error if the function is not called with the correct arguments

Code

local function foo(bar)
  if type(bar) ~= "number" then
    error("bad argument #1 (expected number, got " .. type(bar) .. ")", 2)
  end
end
foo(1)
foo("Hello World")

Output

program.lua:7: bad argument #1 (expected number, got string)

This article is issued from Computercraft. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.