Exploring Dynamism - Randal
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Slides: File:Exploring dynamism.pdf
- "a mental exploration of dynamic language features"
- "crystalize what dynamism is"
- static vs dynamic as particle vs wave
- sometimes a binary distinction, sometimes not
- "no language is entirely static or dynamic"
- you can do more stuff with a dynamic type system
- think of it as a way to extend the type system by having types inspect run-time state
- "stages of dynamism"
- multiple dispatch can be done either statically or dynamically
- many forms of caching (polymorphic inline caching, et. al.) are forms of dynamic dispatch
- not strictly a dynamic language feature, but more common in dynamic langs than in static ones
- annotations (ex: research at IBM on using annotations to enforce web application security constraints)
- compiling blocks of code, capturing the environment around that code (closures, runtime environment, etc.)
- higher-order functions: methods generating other methods at runtime
- interaction (REPL), as with the Python command line
- sci-fi future: self-modifying code
- another strategy for adding new code at runtime
- including new libraries
- binding routines to objects
- mixins/traits/roles and other cross-cutting inheritance/extension models
- dynamic unloading: not often seen because dynamic languages traditionally power applications that run for short periods and wouldn't see gains from unloading to free up memory
- "static systems and dynamic systems are both critical"
- tradeoffs of tighter control vs greater abstraction, productivity vs performance
- hybrid systems may be the most effective