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Go 学习笔记 - 基础篇2 更多高级的类型

  • 2026-02-07 20:35:35
Go 学习笔记 - 基础篇2 更多高级的类型

大家好我是小西,从今天开始,我将开始更新Go基础篇的笔记

预计有5篇,基础篇写完了,再写应用篇,大致是这个计划

老手可以回顾回顾 ,温故知新新手可以收藏一下 做个参考

今天更新第二篇,内容是 Go 更多高级的类型

指针

指针中保存的了值的内存地址,所以指针是地址

var p *int // 声明指针i := 42 :p = &I // 指针初始化

使用 *完成读和写操作

fmt.Println(*p) // read i through the pointer p*p = 21 // set i through the pointer p

Go中指针,没有运算,就这些

结构体 Structs

type Vertex struct {  X int  Y int}

使用 type name struct {} 来定义结构体

指针也可以指向结构体使用 .Field 来读写属性

结构体初始化v1 = Vertex{1, 2}v2 = Vertex{X: 1} // Y属性自动赋值为0

数组

定义是一个数组,长度为10这个长度是数组类型的一部分,不可变

var a [10]intprimes := [6]int{23571113}

切片Slices

primes := [6]int{23571113}var s []int = primes[1:4// 基于数组定义切片

切片自己不保存数据,只是数组一个视图

修改切片中的值会修改原数组:

package mainimport "fmt"funcmain() {names := [4]string{  "John",  "Paul",  "George",  "Ringo",}fmt.Println(names)a := names[0:2]b := names[1:3]fmt.Println(a, b)b[0] = "XXX"fmt.Println(a, b)// names 也会改变fmt.Println(names)}

快速创建的切片

q := []int{2, 3, 5, 7, 11, 13}

切片有 length  capacity 两个属性,可以使用len(s)  cap(s) 来获取

分别对应切片的长度和切片底层数组的长度

切片的零值是 nil, 这是不可用的

你可以使用 make 来创建可用的切片

a := make([]int, 5)len  cap 5的切片

b := make([]int, 0, 5) len  0 cap  5的切片

切片中可以包含其它切片

board := [][]string{  []string{"_""_""_"},  []string{"_""_""_"},  []string{"_""_""_"},}

内置函数 append 可往切片中追加元素,当背后的数组长度不够,

会新分配一个底层数组

func append(s []T, vs ...T) []T

遍历 slice 可以用 for range 

var pow = []int{1248163264128}funcmain() {  for i, v := range pow {    fmt.Printf("2**%d = %d\n", i, v)  }}

不需要的值可以使用 _ 

Map 

用于保存健值对的类型

type Vertex struct {  Lat, Long float64}var m map[string]Vertex

Map 的初始化也使用make

m = make(map[string]Vertex)

也可以使用字面量,直接定义内容, 

因为外层已经有 Vertex 结构体名,内部的 Vertex 可以省略

var m = map[string]Vertex{"Bell Labs": Vertex{  40.68433-74.39967,},"Google": Vertex{  37.42202-122.08408,},}var m = map[string]Vertex{  "Bell Labs": {40.68433-74.39967},  "Google":    {37.42202-122.08408},}

读取和修改直接用 m[key]就可以了

Go还支持map的存在性检测,不需要额外函数

elem, ok = m[key]

如果 key 存在 ,ok 则为 true 

函数值

hypot := func(x, y float64) float64 {  return math.Sqrt(x*x + y*y)}

可以这个定义一个函数

函数也可以接收另一个函数 fn是外部传入的函数

funccompute(fn func(float64float64) float64float64 {  return fn(34)}funcadder() func(int) int {  sum := 0  return func(x int) int {    sum += x    return sum}}

调用adder 会返回一个闭包函数,这个函数保留了对 sum 的引用,当外层函数 adder 执行完成后

最后是一个练习,使用闭包函数输出斐波那契数组

package mainimport "fmt"// fibonacci is a function that returns// a function that returns an int.funcfibonacci() func() int {    a, b := 01    return func() int {        result := a        a, b = b, a+b        return result    }}funcmain() {	f := fibonacci()    for i := 0; i < 10; i++ {		fmt.Println(f())	}}

感谢你看到这,如果本文对你有帮助,记得给我一个赞哦~

原文链接 中我放了 Go Tour 的链接,你可以看看

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  1. CONNECT:[ UseTime:0.000924s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001441s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006647s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.020773s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001412s ]
  6. SELECT * FROM `set` [ RunTime:0.035904s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002577s ]
  8. SELECT * FROM `article` WHERE `id` = 463338 LIMIT 1 [ RunTime:0.029869s ]
  9. UPDATE `article` SET `lasttime` = 1770575115 WHERE `id` = 463338 [ RunTime:0.042242s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004525s ]
  11. SELECT * FROM `article` WHERE `id` < 463338 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008562s ]
  12. SELECT * FROM `article` WHERE `id` > 463338 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004005s ]
  13. SELECT * FROM `article` WHERE `id` < 463338 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017463s ]
  14. SELECT * FROM `article` WHERE `id` < 463338 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.114980s ]
  15. SELECT * FROM `article` WHERE `id` < 463338 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.127992s ]
0.550787s