Smalltalk, Objects, and Design
This reference and text treats the Smalltalk programming system and the web of object-oriented ideas within and around it. Thus it is more than a guide to the language; it also examines Smalltalk in its technical and historical setting, and along the way addresses the questions that every Smalltalk developer sooner or later naturally wonders about.
Expression Type - Result
String - string
Movie clip - movieclip
Button - object
Text field - object
Number - number
Boolean - boolean
Object - object
Function - function