iterator built-ins roadmap

roadmap.md

• Stage 4: iterator helpers MVP
• Stage 4: iterator sequencing (Iterator.concat)
• Stage 3: joint iteration (Iterator.zip, Iterator.zipKeyed)
• Stage 2.7: iterator chunking (.chunks, .windows)
• Stage 2.7: iterator includes (.includes)
• Stage 2.7: iterator join (.join)
• Stage 2: async iterator helpers MVP (AsyncIterator.prototype.*, Iterator.prototype.toAsync)
• Stage 1: concurrency control (AsyncIterator.prototype.* integration, some form of cancellation)
• Stage 1: unordered async iterator helpers (AsyncIterator.prototype.unordered, UnorderedAsyncIterator.prototype.*)
• Stage 1: iterator unique
• SOON: Builder/FromIterator protocol and Iterator.prototype.to/collect and built-in accumulators/collectors
• SOON: a short-circuiting reduce via IteratorResult objects
• MAYBE: .takeWhile, .dropWhile
• MAYBE: a way to register a callback when the iterator is exhausted or closed (withCleanup?)
• MAYBE: .scan: like reduce, but produces an iterator of all intermediate memos
• MAYBE: Iterator.prototype.into = function (f) { return f(this) }
• MAYBE: .tap/.tee/.peek