golang实现高阶函数之map

 package main

 import "fmt"

 func iMap(num []int, f func(a int) int) []int{
     var r []int

     for _, n := range num{
         r = append(r, f(n))
     }

     return r
 }

 func main() {
     num := []int{, , , }

     fmt.Println("before: ", num)

     result := iMap(num, func(a int) int{
         return a *
     })

     fmt.Println("after: ", result)
 }

执行结果：

before:  [   ]
after:  [   ]