[go-nuts] Re: Small complete examples which show the power of Go?
, | I always liked Rob Pike's concurrent prime seive: | https://play.golang.org/p/9U22NfrXeq ` i think what you are looking for is an elegant paper by doug-mcllroy called "squinting at power series" which bring the power of channels etc to stream processing... -- kind regards anupam -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Re: Small complete examples which show the power of Go?
Iterations over slices, maps, channels are very cool, usually straight to
the point :
func main() {
for _, a := range []int{6, 4} {
for _, b := range []int{2, 3} {
for fname, f := range map[string]func(int, int) int{
"plus": func(x, y int) int { return x + y },
"minus": func(x, y int) int { return x - y },
"times": func(x, y int) int { return x * y },
"div": func(x, y int) int { return x / y },
} {
fmt.Println(a, fname, b, "is", f(a, b))
}
}
}
}
Playground
Then you may tell some specific details : why the underscores for ignored
iteration variables, and why the map iteration order is not the same as the
order in the code. Also, I find these iterations quite versatile in
practice, but they work only on built-in types (you won't have java-like
custom iterables).
Cheers
Val
On Wednesday, August 10, 2016 at 9:53:38 AM UTC+2,
gary.wi...@victoriaplumb.com wrote:
>
> Hi,
>
> I'm giving a talk at work introducing Go and I'm looking for small
> examples to show Go's potential. For example, the following program
> demonstrates a bare-bones webserver in 13 lines:
>
> import (
>
> "fmt"
> "net/http"
> )
>
> func home(w http.ResponseWriter, r *http.Request) {
> fmt.Fprintf(w, "Hello, world!")
> }
>
> func main() {
> http.HandleFunc("/", home)
> http.ListenAndServe(":8080", nil)
> }
>
> Has anyone here got any more little snippets like this to show the power
> and potential of Go? It doesn't have to be in networking, just little a
> little snippet to make people think "wow, that's cool!".
>
> Thanks.
>
>
>
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[go-nuts] Re: Small complete examples which show the power of Go?
Easy parallelization and concurrency:
package main
import (
"runtime"
)
func FoldParallel(data []float64, initialValue float64, op func(float64,
float64) float64) float64 {
sliceSize := len(data) / runtime.NumCPU()
results := make(chan float64, runtime.NumCPU())
numResults := 0
for i := 0; i < len(data); i += sliceSize {
numResults++
go func(dataSlice []float64) {
result := float64(initialValue)
for _, v := range dataSlice {
op(result, v)
}
results <- result
}(data[i : i+sliceSize])
}
result := initialValue
for i := 0; i < numResults; i++ {
result = op(result, <-results)
}
return result
}
func main() {
var data [1000]float64
// parallel sum
FoldParallel(data[:], 0, func(v1, v2 float64) float64 { return v1 + v2
})
// parallel mul
FoldParallel(data[:], 1, func(v1, v2 float64) float64 { return v1 * v2
})
}
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