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invalid

Any invalid value indicates that the current value is useless. For example, this occurs when the user is asked to choose a picture but declines to do so.
var pic := media → choose picture
If you did not choose any picture, the returned picture will be invalid. You can test if a value is invalid by using the is invalid action.
if pic → is invalid then
"This picture is invalid!" → post to wall
else ... end if
Calling a property on an invalid value will fail.
var x := pic → height
function invalid → action returns Action
Creates an invalid Action instance
function invalid → board returns Board
Creates an invalid Board instance
function invalid → boolean returns Boolean
Creates an invalid Boolean instance
function invalid → camera returns Camera
Creates an invalid Camera instance
function invalid → color returns Color
Creates an invalid Color instance
function invalid → contact returns Contact
Creates an invalid Contact instance
function invalid → contact collection returns Collection of Contact
Creates an invalid Contact Collection instance
function invalid → datetime returns DateTime
Creates an invalid DateTime instance
function invalid → form builder returns Form Builder
Creates an invalid Form Builder instance
function invalid → gamepad returns Gamepad
Creates an invalid Gamepad instance
function invalid → json builder returns Json Builder
Creates an invalid Json Builder instance
function invalid → json object returns Json Object
Creates an invalid Json Object instance
function invalid → link returns Link
Creates an invalid Link instance
function invalid → link collection returns Collection of Link
Creates an invalid Link Collection instance
function invalid → location returns Location
Creates an invalid Location instance
function invalid → location collection returns Collection of Location
Creates an invalid Location Collection instance
function invalid → map returns Map
Creates an invalid Map instance
function invalid → matrix returns Matrix
Creates an invalid Matrix instance
function invalid → message returns Message
Creates an invalid Message instance
function invalid → message collection returns Collection of Message
Creates an invalid Message Collection instance
function invalid → message collection action returns Action
Creates an invalid Message Collection Action instance
function invalid → number returns Number
Creates an invalid Number instance
function invalid → number collection returns Collection of Number
Creates an invalid Number Collection instance
function invalid → number map returns Number Map
Creates an invalid Number Map instance
function invalid → oauth response returns OAuth Response
Creates an invalid OAuth Response instance
function invalid → page returns Page
Creates an invalid Page instance
function invalid → page button returns Page Button
Creates an invalid Page Button instance
function invalid → page collection returns Collection of Page
Creates an invalid Page Collection instance
function invalid → picture returns Picture
Creates an invalid Picture instance
function invalid → place returns Place
Creates an invalid Place instance
function invalid → place collection returns Collection of Place
Creates an invalid Place Collection instance
function invalid → position action returns Action
Creates an invalid Position Action instance
function invalid → song returns Song
Creates an invalid Song instance
function invalid → sound returns Sound
Creates an invalid Sound instance
function invalid → sprite returns Sprite
Creates an invalid Sprite instance
function invalid → sprite action returns Action
Creates an invalid Sprite Action instance
function invalid → sprite animation returns Sprite Animation
Creates an invalid Sprite Animation instance
function invalid → sprite set returns Sprite Set
Creates an invalid Sprite Set instance
function invalid → sprite set action returns Action
Creates an invalid Sprite Set Action instance
function invalid → string returns String
Creates an invalid String instance
function invalid → string collection returns Collection of String
Creates an invalid String Collection instance
function invalid → string map returns String Map
Creates an invalid String Map instance
function invalid → text action returns Action
Creates an invalid Text Action instance
function invalid → textbox returns TextBox
Creates an invalid TextBox instance
function invalid → user returns User
Creates an invalid User instance
function invalid → vector3 returns Vector3
Creates an invalid Vector3 instance
function invalid → vector action returns Action
Creates an invalid Vector Action instance
function invalid → web request returns Web Request
Creates an invalid Web Request instance
function invalid → web response returns Web Response
Creates an invalid Web Response instance
function invalid → webresponse action returns Action
Creates an invalid WebResponse Action instance
function invalid → xml object returns Xml Object
Creates an invalid Xml Object instance