1.如下代码中的函数传参

package main

import "fmt"
func add1(a *int)int{
    *a = *a + 1
    return *a
}

type testInt func(int) bool  // define a func type

func isOdd(integer int) bool {
    if integer % 2 == 0 {
        return false
    }
    return true
}

func isEven(integer int) bool {
    if integer % 2 == 0 {
        return true
    }
    return false
}

func filter(slice []int, f testInt) []int {
    var result []int
    for _, value := range slice {
        if f(value) {
            result = append(result, value)
        }
    }
    return result
}

func main(){
    slice := []int {1, 2, 3, 4, 5, 7}
    fmt.Println("slice = ", slice)
    odd := filter(slice, isOdd)
    fmt.Println("Odd elements of slice are: ", odd)
    even := filter(slice, isEven)
    fmt.Println("Even elements of slice are: ", even)
}

filter函数的第二个参数是函数，可以看到直接将isOdd, isEven传入了。