Structs: Building Custom Data Types

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Structs: Building Custom Data Types

Structs are composite data types that group together zero or more values with different types into a single entity. You define a struct with the type keyword, followed by a name and the struct body containing field declarations. Structs can be initialized using field names (named fields) or positional values, and fields can be accessed and modified using the dot notation.

snippet.go

package main
 
import "fmt"
 
type Person struct {
    Name string
    Age  int
}
 
func main() {
    person1 := Person{Name: "Alice", Age: 30}
    person2 := Person{"Bob", 25}
    var person3 Person
 
    fmt.Println(person1.Name)
    fmt.Println(person2.Age)
 
    person3.Name = "Carol"
    person3.Age = 28
 
    fmt.Printf("%+v\n", person3)
}

Breakdown

type Person struct { ... }

Defines a new struct type called Person

person1 := Person{Name: "Alice", Age: 30}

Creates instance with named field initialization

person2 := Person{"Bob", 25}

Creates instance with positional values (order matters)

var person3 Person

Declares person3 with zero values ("", 0)

person3.Name = "Carol"

Access and modify fields using dot notation

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