Go 學習筆記

標籤：

m := make(map[string]int)m["Answer"] = 48v, ok := m["Answer"]fmt.Println("The value:", v, "Present?", ok)delete(m, "Answer")fmt.Println("The value:", v, "Present?", ok)

The value: 48 Present? true
The value: 0 Present? false

func main() {    a := make([]int, 5)    printSlice("a", a)    b := make([]int, 0, 5)    printSlice("b", b)    c := b[:2]    printSlice("c", c)    d := c[2:5]    printSlice("d", d)    printSlice("b", b)}func printSlice(s string, x []int) {    fmt.Printf("%s len=%d cap=%d %v\n",        s, len(x), cap(x), x)}

a len=5 cap=5 [0 0 0 0 0]
b len=0 cap=5 []
c len=2 cap=5 [0 0]
d len=3 cap=3 [0 0 0]
b len=0 cap=5 []

var pow = []string{"hehe", "haha"}for i, v := range pow {        fmt.Printf("2**%d = %s\n", i, v)    }

2**0 = hehe
2**1 = haha

Go 學習筆記