main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
)
type filterFunc func(int) bool
func main() {
fmt.Println("••• HIGHER-ORDER FUNCS •••")
nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
odd := reverse(reverse(isEven))
fmt.Printf("reversed : %t\n", odd(8))
fmt.Printf("> 3 : %d\n", filter(greater(3), nums...))
fmt.Printf("> 6 : %d\n", filter(greater(6), nums...))
fmt.Printf("<= 6 : %d\n", filter(lesseq(6), nums...))
fmt.Printf("<= 6 : %d\n", filter(reverse(greater(6)), nums...))
}
func reverse(f filterFunc) filterFunc {
return func(n int) bool {
return !f(n)
}
}
func greater(min int) filterFunc {
return func(n int) bool {
return n > min
}
}
func lesseq(max int) filterFunc {
return func(n int) bool {
return n <= max
}
}
func filter(f filterFunc, nums ...int) (filtered []int) {
for _, n := range nums {
if f(n) {
filtered = append(filtered, n)
}
}
return
}
func isEven(n int) bool { return n%2 == 0 }
func isOdd(m int) bool { return m%2 == 1 }
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