Contents

Golang 中的类型

2020-05-14 183 words One minute

Contents

类型分类

1. 值类型和指针类型

值类型: 变量之间传递的的是值的拷贝
指针类型: 变量之间传递的是指针的拷贝

1. 基础类型

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int
float32, float64
bool
string

2.复合类型

container
1. arrary
2. slice
3. map
struct
pointer
channel
function
interface

3. 类型的声明（type declaration）

1. type definitions vs type alias

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// 1. basic type 
type A int
// 2. struct 
type Bird struct {

}
// 3. interface 
type BirdInterface interface {

}

2. type alias

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type Name = int

3. definition vs alias

definition:
1. create a new type
alias
1. not create a new type

use case: Representing enums in go

enum

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type Suite int

const (
  unknown Suite = iota
  Spades
  Hearts
  Diamond
  Clubs
  sentinel
)

func (s Suite) isValid() bool {
  return  s > unknown && s < sentinel
}

add function

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type Person string
func (p Person) Hello(anotherPerson Person) {
    fmt.Printf("%s, Hello from %s", anotherPerson, p)
}
elon := Person("Elon Musk")
aleh := Person("Aleh")
elon.Hello(aleh) // Aleh, Hello from Elon Musk