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58e4d26648
Get rid of the separate opt-in IO class and replace it with a core System class. - Remove wren_io.c, wren_io.h, and io.wren. - Remove the flags that disable it. - Remove the overloads for print() with different arity. (It was an experiment, but I don't think it's that useful.) - Remove IO.read(). That will reappear using libuv in the CLI at some point. - Remove IO.time. Doesn't seem to have been used. - Update all of the tests, docs, etc. I'm sorry for all the breakage this causes, but I think "System" is a better name for this class (it makes it natural to add things like "System.gc()") and frees up "IO" for referring to the CLI's IO module.
49 lines
1.1 KiB
Plaintext
49 lines
1.1 KiB
Plaintext
// Infinite iterator demonstrating that Sequence.map is not eager
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class FibIterator {
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construct new() {
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_current = 0
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_next = 1
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}
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iterate {
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var sum = _current + _next
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_current = _next
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_next = sum
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}
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value { _current }
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}
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class Fib is Sequence {
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construct new() {}
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iterate(iterator) {
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if (iterator == null) return FibIterator.new()
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iterator.iterate
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return iterator
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}
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iteratorValue(iterator) { iterator.value }
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}
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var squareFib = Fib.new().map {|fib| fib * fib }
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var iterator = null
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System.print(squareFib is Sequence) // expect: true
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System.print(squareFib) // expect: instance of MapSequence
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iterator = squareFib.iterate(iterator)
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System.print(squareFib.iteratorValue(iterator)) // expect: 0
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iterator = squareFib.iterate(iterator)
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System.print(squareFib.iteratorValue(iterator)) // expect: 1
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iterator = squareFib.iterate(iterator)
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System.print(squareFib.iteratorValue(iterator)) // expect: 1
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iterator = squareFib.iterate(iterator)
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System.print(squareFib.iteratorValue(iterator)) // expect: 4
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iterator = squareFib.iterate(iterator)
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System.print(squareFib.iteratorValue(iterator)) // expect: 9
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