Go by Example: Structs

Go by Example : Structs

Go’s structs are typed collections of fields. They’re useful for grouping data together to form records.
	`package main`
	`import "fmt"`
This `person`struct type has `name`and `age`fields.	`type person struct { name string age int }`
`newPerson`constructs a new person struct with the given name.	`func newPerson(name string) *person {`
Go is a garbage collected language; you can safely return a pointer to a local variable - it will only be cleaned up by the garbage collector when there are no active references to it.	`p := person{name: name} p.age = 42 return &p }`
	`func main() {`
This syntax creates a new struct.	`fmt.Println(person{"Bob", 20})`
You can name the fields when initializing a struct.	`fmt.Println(person{name: "Alice", age: 30})`
Omitted fields will be zero-valued.	`fmt.Println(person{name: "Fred"})`
An `&`prefix yields a pointer to the struct.	`fmt.Println(&person{name: "Ann", age: 40})`
It’s idiomatic to encapsulate new struct creation in constructor functions	`fmt.Println(newPerson("Jon"))`
Access struct fields with a dot.	`s := person{name: "Sean", age: 50} fmt.Println(s.name)`
You can also use dots with struct pointers - the pointers are automatically dereferenced.	`sp := &s fmt.Println(sp.age)`
Structs are mutable.	`sp.age = 51 fmt.Println(sp.age)`
If a struct type is only used for a single value, we don’t have to give it a name. The value can have an anonymous struct type. This technique is commonly used for table-driven tests .	`dog := struct { name string isGood bool }{ "Rex", true, } fmt.Println(dog) }`

$ go run structs.go
{Bob 20}
{Alice 30}
{Fred 0}
&{Ann 40}
&{Jon 42}
Sean
50
51
{Rex true}

Next example: Methods .

Go by Example: Struct Embedding

Go by Example: Switch

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Go by Example: Structs

Go by Example : Structs