Go语言－切片和map

实例

package main

import (
                "fmt"
)

func main() {
                arr :=  make([]int, 0)
                //arr :=  make([]int)   is wrong
                //arr :=  make([]int, 100)   is right
                arr = append(arr, 1)
                arr = append(arr, 2)
                arr = append(arr, 3)
                arr = append(arr, 4)
                mymap := make(map[int]string)
                //mymap := make(map[int]string, 0)
                //mymap := make(map[int]string,1) is right
                mymap[0] = "10"
                mymap[1] = "110"
                mymap[2] = "1110"
                for _, val := range arr {
                                fmt.Println("val:", val)
                }

                for _, val := range mymap {
                                fmt.Println("val:", val)
                }
                fmt.Println()

    }

运行结果

    val: 1
    val: 2
    val: 3
    val: 4
    val: 10
    val: 110
    val: 1110