golang 基础

JUST笔记

Go语言主要特性

• 自动垃圾回收(Python: so easy?)
• 丰富内置类型(Python: I don't think so)
• 函数多返回值(Python: I can)
• 错误处理(Python:are you sure?)
• 匿名函数和闭包(Python: give me something new?)
• 类型和接口(Python: Not bad!)
• 并发编程(Python: Yes, double click & 666)
• 反射(I do not use and I do not know)
• 语言交互性(Python: Now, I just found I like you)

Let's say "Hello World!"

package main
// you konw "one line comment"
import "fmt"
/* More
Line
Comment
*/
func main(){
  fmt.Printf("Hello World!")
}

How to download

• Just google or baidu, I dont care. You all need just kown what's gopath
• I'm using vscode, perfect for me to code

声明个变量

• var v int = 666
• v := 666
• var v = 666
• var v1 [3]int {6,6,6}
• var v2 []int {6,6,6}
• 匿名变量 _
• i, j = j, i

类型

• bool
• int8/byte/int16/int/uint
• float32/float64
• complex64/complex128(How to use?)
• string
• rune
• error
• 指针(pointer)
• 数组(array)
• 切片(slice)
• 字典(map)
• 通道(chan)
• 结构体(struct)
• 接口(interface)

遍历元素

package main
import "fmt"

func main(){
  a = [3]int{6,6,6}

  for i :=0; i<len(a); i++ {
      fmt.Println(a[i])
  }

  for _, i := range a {
      fmt.Println(i)
  }
}

make

package main
import "fmt"
func main() {
  //cap = 10 5个元素默认为0 {0,0,0,0,0}
  myslice := make([]int, 5, 10)

}

while? break?for?

package main
import "fmt"
func main() {
  i := 0
  for {
    fmt.Println(i)
    i ++
    if i > 100 {
      break
    }
  }
}

函数调用

• 小写字母函数只在本包内可见, 大写字母开头的函数才能被其他包调用

任意类型不定参数

func myfunc(args ...interface{}){
}

匿名函数(hah)

func (x, y int) bool{
  return x < y
}