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package main
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import (
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"fmt"
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)
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func main() {
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randomNumbers := []int{13, 44, 56, 99, 9, 45, 67, 90, 78, 23}
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// generate the common channel with inputs
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inputChan := generatePipeline(randomNumbers)
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// Fan-out to 2 Go-routine
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c1 := squareNumber(inputChan)
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c2 := squareNumber(inputChan)
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// Fan-in the resulting squared numbers
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c := fanIn(c1, c2)
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sum := 0
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// Do the summation
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for i := 0; i < len(randomNumbers); i++ {
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sum += <-c
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}
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fmt.Printf("Total Sum of Squares: %d", sum)
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}
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func generatePipeline(numbers []int) <-chan int {
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out := make(chan int)
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go func() {
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for _, n := range numbers {
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out <- n
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}
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close(out)
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}()
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return out
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}
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func squareNumber(in <-chan int) <-chan int {
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out := make(chan int)
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go func() {
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for n := range in {
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out <- n * n
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}
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close(out)
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}()
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return out
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}
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func fanIn(input1, input2 <-chan int) <-chan int {
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c := make(chan int)
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go func() {
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for {
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select {
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case s := <-input1:
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c <- s
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case s := <-input2:
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c <- s
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}
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}
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}()
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return c
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}
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