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The purpose of the LSL3 project is to design a new programing language that would replace LSL2 in Second Life.

Design Ideals

  • It should be designed to enable expression and not hinder expression with complex or over burdensome syntax requirements.
  • C style syntax and order of operations
  • Type safety
  • Strongly Typed


  • Address the shortcomings of LSL2 and add new functionality while limiting the increase of language complexity.
  • Design LSL3 with Hierarchical Linking in mind MISC-2237

Proposed Changes for LSL2

Here are some proposed changes to LSL2. Please add new changes, if they cannot be summed up in a single sentence please create a subpage to this article and put a link in the appropriate section.

Major changes

  • Object model
  • Get rid of get and set functions, use getters and setters instead where possible (syntax sugar).
  • Persistent storage/memory


  • Fix quaternion ordering
  • Provide quaternion-scalar multiplication
  • Provide quaternion exponentiation q^a where a is a float. (Useful for interpolating rotations to achieve smoothness)
  • Object model for base types
  • Array indexer
  • continue and break keywords.
  • switch statement.


  • User defined class & structures
    • Duck Typing (LinFu?)
    • Anonymous classes?
  • bool type
  • pointers
  • Remove restriction on lists containing lists
  • const


  • Organized into static classes?
  • Or keep the namespace flat to keep the syntax simple.

States & Events

  • State variables.
  • User defined events that can be triggered by external scripts.
  • Functions that are only available to specific states.


  • Script libraries that can be sold and passed around.
  • Natural syntax which can be used instead of link_message

Flaws with LSL2

Here is a list of flaws with LSL2 that should be fixed.

Combining Quaternions

  • See SVC-1047 for a full description of this.

Evaluation order

  • Given the code f(a) + g(a), currently g(a) gets executed before f(a).
    • Changing this so f(a) gets executed first should improve performance on Mono.

Comparisons of lists

  • Only length is compared.
  • The result of a list equality is the difference of the lengths.

'if else' syntax

  • if([1]) evaluates to false.
  • if !(STRING) gives syntax error, forcing if (STRING == "") Applies to all types in which ! cannot be put directly in front.


  • Does not support negative indexes.

llDetected* Functions

  • Do not support negative indexes.