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54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// Go's _structs_ are typed collections of fields.
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// They're useful for grouping data together to form
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// records.
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package main
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import "fmt"
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// This `person` struct type has `name` and `age` fields.
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type person struct {
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name string
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age int
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}
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// NewPerson constructs a new person struct with the given name
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func NewPerson(name string) *person {
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// You can safely return a pointer to local variable
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// as a local variable will survive the scope of the function.
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p := person{name: name}
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p.age = 42
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return &p
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}
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func main() {
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// This syntax creates a new struct.
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fmt.Println(person{"Bob", 20})
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// You can name the fields when initializing a struct.
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fmt.Println(person{name: "Alice", age: 30})
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// Omitted fields will be zero-valued.
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fmt.Println(person{name: "Fred"})
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// An `&` prefix yields a pointer to the struct.
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fmt.Println(&person{name: "Ann", age: 40})
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// It's idiomatic to encapsulate new struct creation in constructor functions
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fmt.Println(NewPerson("Jon"))
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// Access struct fields with a dot.
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s := person{name: "Sean", age: 50}
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fmt.Println(s.name)
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// You can also use dots with struct pointers - the
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// pointers are automatically dereferenced.
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sp := &s
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fmt.Println(sp.age)
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// Structs are mutable.
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sp.age = 51
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fmt.Println(sp.age)
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}
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