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  1. package main
  2.  
  3. import (
  4. 	"fmt"
  5. )
  6.  
  7. type Callback func() int
  8.  
  9. func doSomething() {}
  10.  
  11. func callbackFactory(i int) Callback {
  12. 	return func() int {
  13. 		fmt.Println("callback", i)
  14. 		return i
  15. 	}
  16. }
  17.  
  18. var callbacks []Callback = []Callback{
  19. 	callbackFactory(1),
  20. 	callbackFactory(2),
  21. 	callbackFactory(3),
  22. 	callbackFactory(4)}
  23.  
  24. func combiner(results []int) int {
  25. 	sum := 0
  26. 	for result := range results {
  27. 		sum += result
  28. 		if result == 2 {
  29. 			break
  30. 		}
  31. 	}
  32. 	return sum
  33. }
  34.  
  35. func main() {
  36.  
  37. 	results := make([]int, len(callbacks))
  38. 	for idx, callback := range callbacks {
  39. 		doSomething()
  40. 		results[idx] = callback()
  41. 	}
  42. 	fmt.Println("sum", combiner(results))
  43. }
  44.  
Success #stdin #stdout 0s 420544KB
comments (?)
stdin 
Standard input is empty
stdout 
callback 1
callback 2
callback 3
callback 4
sum 3
https://ideone.com/dRYZDb
language:
Go (go 1.12.1)
created:
9 years ago
visibility:
public

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