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@DanyelMorales
Created August 11, 2021 20:26
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OR CHANNELS
package main
import (
"fmt"
"time"
)
func main() {
var or func(channels ...<-chan interface{}) <-chan interface{}
or = func(channels ...<-chan interface{}) <-chan interface{} {
switch len(channels) {
case 0:
return nil
case 1:
return channels[0]
}
orDone := make(chan interface{})
go func() {
defer close(orDone)
switch len(channels) {
case 2:
select {
case <-channels[0]:
case <-channels[1]:
}
default:
select {
case <-channels[0]:
case <-channels[1]:
case <-channels[2]:
case <-or(append(channels[3:], orDone)...):
}
}
}()
return orDone
}
sig := func(after time.Duration) <-chan interface{} {
c := make(chan interface{})
go func() {
defer close(c)
time.Sleep(after)
}()
return c
}
start := time.Now()
<-or(sig(5*time.Hour), sig(2*time.Minute), sig(2*time.Second), sig(5*time.Minute))
fmt.Printf("done after %v", time.Since(start))
}
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