golang 学习笔记（1）数组，切片，字典

// test10 project main.gopackage mainimport ("fmt")const (a    int    = 1b    string = "td"flag bool   = falsec           = "33")func testArray() {//一维数组var arr [2]intarr[0] = 1arr[1] = 1var arr2 [2]int = [2]int{1, 2} ////可以简写 如：var arr2=[2]int{1,2}var arr3 [2]int = [...]int{1, 2}//二维数组var arr4 [2][2]int = [2][2]int{[2]int{1, 2}, [2]int{3, 4}}var arr5 [2][2]int = [2][2]int{[...]int{1, 2}, [...]int{3, 4}}var arr6 [2][2]int = [2][2]int{{2, 3}, {3, 4}}}/*数组和slice的区别a.生命数组的时候，方括号内写明了数组的长度或者...,生命slice的时候，方括号内为空b.作为函数参数的时候，数组传递的是数组的副本，而slice传递的是指针*/func testSlice() {//var arr1 []int     //创建切片//arr1 := make([]int, 2)  //创建slicearr := []int{1, 2}//对于数组切片var tmp = [3]int{1, 2, 3}arr = tmp[0:2]//slice appendarr = append(arr, 1, 2, 3)for i := 0; i < len(arr); i++ {fmt.Println("%d", arr[1])}}func testMap() {//var m map[string]int      //创建map////m := make(map[string]int) //创建mapm := map[string]int{"one": 1, "two": 2, "three": 3}m["one"] = 5//遍历for k, v := range m {fmt.Println(k, v)}//判断key是否存在,v位value，ok位标示  true|falsev, ok := m["e"]fmt.Print(v, ok)//删除键delete(m, "one")}