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This article mainly introduces the Go language type alias and custom type example analysis, the article is very detailed, has a certain reference value, interested friends must read!

Go does not have the concept of classes, nor does it support object-oriented concepts such as inheritance of "classes."

Go has a higher extensibility and flexibility than object-oriented programming through built-in refit interfaces in structs.

1. Type aliases and custom types

1.1 custom type

There are some basic data types in Go, such as string, integer, floating point, Boolean and other data types. In Go, you can use the type keyword to define custom types.

A custom type defines a completely new type. We can define it based on built-in primitive types or we can define it via struct.

//define MyInt as int type

type MyInt int

By definition of the Type keyword, MyInt is a new type that has the properties of int.

1.2 type alias

Type aliases are a new feature added in Go 1.9.

TypeAlias rule: TypeAlias is simply an alias for Type, and TypeAlias is essentially the same type as Type. Like our English names, our baby names, but they all refer to one person.

type TypeAlias = type

The rune and byte we saw earlier are both type aliases, defined as follows:

type byte = uint8

type rune = int32

1.3 Difference between type definition and type alias

Type aliases and type definitions, on the surface, only one equal sign difference, we can see the difference between them through the following code.

package main

import "fmt"

type NewInt int

type MyInt = int

func main() {

var a NewInt

var b MyInt

fmt.Printf("type of a:%T\n",a)

fmt.Printf("type of b:%T\n",b)

}

Results:

type of a:main.NewInt

type of b:int

Process finished with exit code 0

The result shows that the type of a is main.NewInt, which means the NewInt type defined under the main package.

Type b is int. MyInt type will only exist in code, there will be no MyInt type when compilation is complete.

The above is all the content of this article "Example analysis of type aliases and custom types in Go language", thank you for reading! Hope to share the content to help everyone, more relevant knowledge, welcome to pay attention to the industry information channel!

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