Outline

• An example:

  • Tcl: universal scripting language.
  • Tk: GUI toolkit based on Tcl.

• Language rationale:

  • Unusual design goals (e.g. extensibility).
  • Key features:
    • Unstructured (everything's a string).
    • No grammar.
    • Quote by default.
    • Substitutions.

• Challenge: raise the level of language design.

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