Go語言－切片和map

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執行個體

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()    }運行結果    val: 1    val: 2    val: 3    val: 4    val: 10    val: 110    val: 1110

Go語言－切片和map