Assert
From GiderosMobile
Available since: Gideros 2011.6
Class: (global)
Description
Issues an error when the value of its argument v is false (i.e.: nil or false), otherwise returns all its arguments.
assert(v,message)
message is an error message, when absent it defaults to "assertion failed!".
Parameters
v: (any) expression/function to assert
message: (string) error message if assert fails optional
Examples
Checks if a texture is valid
function isValidTexture()
local result, msg = assert(Texture.new(texturepath), "file is not recognised")
print(result, msg)
return result
end
function showTexture()
if isValidTexture() then bmp = Bitmap.new(Texture.new(texturepath)) end
end
Checks if is of type number
local value = 12 --> 12
--local value = "hello" --> *** Friction must be a number ***
assert(type(value) == 'number', "*** Friction must be a number ***")
See also
