Talk:Closure (computer programming)/to do

  • Introduction
    • Rewrite lead paragraph (mostly done)
      • In such languages a reference to a function is a reference to a closure...
      • Closure = Function + Environment
      • What happens when creating a closure? (Closure captures the current lexical environment)
      • What happens when entering a closure? (Function is executed in the lexical environment captured by the closure)
      • Picture?
      • Mention all relevant terminology: open, closed, free, bound, captured, closed over
      • Mention closures are an implementation technique for supporting first-class functions
      • Theory: closures in operational semantics
    • Add an introductory section
      • Targeted primarily at imperative programmers who have little experience with non-local variables
    • Closures are an implementation technique
      • A form of activation record on the heap
      • Compare with a stack-allocated version of activation records for nested functions
  • History
  • Semantics
    • Closure (computer programming)#Differences in semantics: Scheme (variables in scope) vs. Smalltalk (variables + return + self) vs, Java 7/8/... (variables + return + this + exceptions + ...)
    • Capturing loop variables
    • Capture by reference vs. capture by copy, extending the lifetime and garbage collection (compare C++)
  • Implementation
    • Luca Cardelli, Compiling a Functional Language.
    • Simon Peyton Jones, Implementation of Functional Programming Languages.
    • Z. Shao and A. W. Appel. Space-efficient closure representations.
    • Upvalues: Roberto Ierusalimschy et al., "The Implementation of Lua 5.0"
    • Funarg problems: closures are intended to solve the more difficult upwards funarg problem, but sometimes also used to solve the downwards.
  • Applications: thunk (delayed computation), memoization, object system, hidden state/static variables

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