85 lines
1.4 KiB
Go
85 lines
1.4 KiB
Go
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package main
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// export GOEXPERIMENT=rangefunc
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import "iter"
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func Step(start, stop, step int) iter.Seq[int] {
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if step < 0 {
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return func(yield func(int) bool) {
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for i := start; i <= start && i > stop; i += step {
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next := yield(i)
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if !next {
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return
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}
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}
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}
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}
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if step > 0 {
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return func(yield func(int) bool) {
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for i := start; i >= start && i < stop; i += step {
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next := yield(i)
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if !next {
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println("stopped!")
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return
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}
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}
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}
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}
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return func(yield func(int) bool) { yield(start) }
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}
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func Fib() iter.Seq[uint] {
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return func(yield func(uint) bool) {
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previous, value := uint(1), uint(1)
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next := yield(value)
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for next {
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next = yield(value)
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value, previous = value+previous, value
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if value < previous {
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return
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}
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}
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}
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}
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func Fizzbuzzed[T int | uint](from iter.Seq[T]) iter.Seq2[T, string] {
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pull, stop := iter.Pull(from)
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return func(yield func(T, string) bool) {
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defer stop()
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for {
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var fizzbuzz string
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p, ok := pull()
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if !ok {
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return
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}
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if p%3 == 0 {
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fizzbuzz = "fizz"
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}
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if p%5 == 0 {
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fizzbuzz += "buzz"
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}
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if !yield(p, fizzbuzz) {
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return
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}
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}
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}
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}
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// func main() {
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// for i, v := range Fizzbuzzed(Fib()) {
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// println(i, v)
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// }
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// }
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func countScan(n int) (func() bool, func() int) {
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pos := -1
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return func() bool {
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pos++
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return pos < n
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}, func() int {
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return pos
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}
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}
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