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() {
signatures()
funcValues()
}
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)
}
func funcValues() {
fmt.Println("\n••• FUNC VALUES (VARS) •••")
// var value func(int) bool
var value filterFunc
fmt.Printf("value nil? : %t\n", value == nil)
value = isEven
fmt.Printf("value(2) : %t\n", value(2))
fmt.Printf("isEven(2) : %t\n", isEven(2))
value = isOdd
fmt.Printf("value(1) : %t\n", value(1))
fmt.Printf("isOdd(1) : %t\n", isOdd(1))
fmt.Printf("value nil? : %t\n", value == nil)
fmt.Printf("value : %p\n", value)
fmt.Printf("isEven : %p\n", isEven)
fmt.Printf("isOdd : %p\n", isOdd)
}
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