golang func and . . .
- 多個回傳值
- 範例
func main() { foo() bar("James") s1 := woo("Moneypenny") fmt.Println(s1) x, y := mouse("Ian", "Fleming") fmt.Println(x) fmt.Println(y) } func foo() { fmt.Println("hello from foo") } func bar(s string) { fmt.Println("Hello,", s) } func woo(st string) string { return fmt.Sprint("Hello from woo, ", st) } func mouse(fn string, ln string) (string, bool) { a := fmt.Sprint(fn, " ", ln, `, says "Hello"`) b := true return a, b } - 傳入值可為 variadic parameter (https://golang.org/ref/spec#Lexical_elements) ，分類為 Lexical elements 中的 operators and punctuation
- 範例
func main() { x := sum(2, 3, 4, 5, 6, 7, 8) fmt.Println("The total is", x) } func sum(x ...int) int { fmt.Println(x) fmt.Printf("%T\n", x) sum := 0 for i, v := range x { sum += v fmt.Println("for item in dex position,", i, "we are now adding,", v, "to the total which is now,", sum) } return sum } - 你也可以自己宣告 一個int的slice Ex. []int，然後用 . . . 傳入
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func main() { xi := []int{2, 3, 4, 5, 6, 7, 8} x := sum(xi...) fmt.Println("The total is", x) } func sum(x ...int) int { fmt.Println(x) fmt.Printf("%T\n", x) sum := 0 for i, v := range x { sum += v fmt.Println("for item in dex position,", i, "we are now adding,", v, "to the total which is now,", sum) } return sum } - End
