Custom Types and Structs in Go

In Go, you can define your own types and create complex data structures using structs.

Custom Types

A custom type is defined using the type keyword. It can be based on existing types:

1type UserID int

Structs

A struct is a collection of fields. It’s used to group data together to form records.

Defining Structs

Use the type keyword followed by the struct name and the keyword struct:

1type Person struct {
2    Name string
3    Age  int
4}

Using Structs

To create an instance of a struct, use the struct name followed by field values:

1p := Person{Name: "Alice", Age: 30}

Methods on Structs

You can define methods on structs:

1func (p Person) Greet() string {
2    return "Hello, my name is " + p.Name
3}

Conclusion

Custom types and structs are powerful features in Go that allow you to define complex data types and structures, making your code more organized and expressive.