What is the difference between `var` and `type` keyword definition structure in Go language?

The difference between var and type keywords defining structures in Go language is that using the var keywords define anonymous structures, while type keyword defines named structures.

Go provides two ways to define structures:

1. Use the var keyword to define anonymous structure:

This way, using the var keyword, declares a variable and defines the type of the variable as an anonymous structure. The structure has no name and is only valid in the line of code that declares the variable.

For example:

 var person struct {
    name string
    age int
}

This is equivalent to:

 type AnonymousStruct struct {
    name string
    age int
}
var person = AnonymousStruct{}

2. Use type keyword to define a named structure:

This way, use type keyword to define a new structure type and name it. This named structure type can be reused elsewhere in the code.

For example:

 type Person struct {
    name string
    age int
}

var person1 = Person{"Alice", 30}
var person2 Person

Summary of key differences:

characteristic	var keyword (anonymous structure)	type keyword (named structure)
Structure name	none	have
Reusability	Not reusable	Reusable
Code readability	Lower	Higher
Use scenarios	Simple scenes that only need to be used once	Complex scenarios that require multiple use

Which method to choose depends on the specific scenario. If you only need to define a structure variable and use it only once, it is simpler to define anonymous structures using the var keyword. If you need to use the same struct type multiple times, or to improve the readability and maintainability of your code, it is better to define named structs using the type keyword.

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