JUST筆記

Go語言主要特性

• 自動垃圾回收(Python: so easy?)
• 豐富內(nèi)置類型(Python: I don't think so)
• 函數(shù)多返回值(Python: I can)
• 錯誤處理(Python:are you sure?)
• 匿名函數(shù)和閉包(Python: give me something new?)
• 類型和接口(Python: Not bad!)
• 并發(fā)編程(Python: Yes, double click & 666)
• 反射(I do not use and I do not know)
• 語言交互性(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

聲明個變量

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

類型

• bool
• int8/byte/int16/int/uint
• float32/float64
• complex64/complex128(How to use?)
• string
• rune
• error
• 指針(pointer)
• 數(shù)組(array)
• 切片(slice)
• 字典(map)
• 通道(chan)
• 結(jié)構(gòu)體(struct)
• 接口(interface)

遍歷元素

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個元素默認(rèn)為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
    }
  }
}

函數(shù)調(diào)用

• 小寫字母函數(shù)只在本包內(nèi)可見, 大寫字母開頭的函數(shù)才能被其他包調(diào)用

任意類型不定參數(shù)

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

匿名函數(shù)(hah)

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