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"
"strings"
"unicode"
)
type filterFunc func(int) bool
func main() {
signatures()
fmt.Println("\n••• WITHOUT FUNC VALUES •••")
nums := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fmt.Printf("evens : %d\n", filterEvens(nums...))
fmt.Printf("odds : %d\n", filterOdds(nums...))
fmt.Println("\n••• FUNC VALUES •••")
fmt.Printf("evens : %d\n", filter(isEven, nums...))
fmt.Printf("odds : %d\n", filter(isOdd, nums...))
fmt.Println("\n••• MAPPING •••")
fmt.Println(strings.Map(unpunct, "hello!!! HOW ARE YOU???? :))"))
fmt.Println(strings.Map(unpunct, "TIME IS UP!"))
}
func unpunct(r rune) rune {
if unicode.IsPunct(r) {
return -1
}
return unicode.ToLower(r)
}
func filter(f filterFunc, nums ...int) (filtered []int) {
for _, n := range nums {
if f(n) {
filtered = append(filtered, n)
}
}
return
}
func filterOdds(nums ...int) (filtered []int) {
for _, n := range nums {
if isOdd(n) {
filtered = append(filtered, n)
}
}
return
}
func filterEvens(nums ...int) (filtered []int) {
for _, n := range nums {
if isEven(n) {
filtered = append(filtered, n)
}
}
return
}
func isEven(n int) bool {
return n%2 == 0
}
func isOdd(m int) bool {
return m%2 == 1
}
func signatures() {
fmt.Println("••• FUNC SIGNATURES (TYPES) •••")
fmt.Printf("isEven : %T\n", isEven)
fmt.Printf("isOdd : %T\n", isOdd)
}
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