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From Unreal Wiki, The Unreal Engine Documentation Site

This group of articles describes UnrealScript language features at the source code level. It is no official document, but aims to cover all features of the UnrealScript language as it is implemented in the Unreal Tournament series. Note that there may be additional features in the implementation of UnrealScript in licensee games.

• UnrealScript source file format
• Declarations
  • Classes
  • Interfaces (only Unreal Engine 3 and some Unreal Engine 2 games)
  • Variables
  • Enums
  • Structs
  • Constants
  • Functions
  • Delegates (not in Unreal Engine 1)
  • Operators
  • States
  • Defaultproperties
    • Subobjects (not in Unreal Engine 1)
• Types
  • Static arrays
  • Dynamic arrays (not in Unreal Engine 1)
• Literals
• Flow control
  • Break statement
  • Continue statement
  • Do loop
  • For loop
  • ForEach loop
  • GoTo statement
  • If statement
  • Return statement
  • Stop statement
  • Switch statement
  • While loop