55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package main
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import (
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"fmt"
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"time"
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)
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type Person struct {
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firstName string
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lastName string
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birthday time.Time
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}
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func main() {
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birthday, _ := time.Parse("2006-Jan-02", "1994-Aug-10")
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person := Person{
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firstName: "Alex",
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lastName: "Kotov",
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birthday: birthday,
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}
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printPersonByValue(person)
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printPersonByRefSafe(&person)
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printPersonByRefUnsafe(&person)
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printPersonByRefSafe(nil)
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printPersonByRefUnsafe(nil)
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}
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func printPersonByValue(person Person) {
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fmt.Println("=== by value =====================================")
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fmt.Println("First name:", person.firstName)
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fmt.Println("Last name: ", person.lastName)
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fmt.Println("Birthday: ", person.birthday)
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}
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func printPersonByRefSafe(person *Person) {
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fmt.Println("=== by reference (safe) ==========================")
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if person == nil {
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fmt.Println("nil pointer, skip...")
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return
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}
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fmt.Println("First name:", person.firstName)
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fmt.Println("Last name: ", person.lastName)
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fmt.Println("Birthday: ", person.birthday)
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}
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func printPersonByRefUnsafe(person *Person) {
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fmt.Println("=== by reference (unsafe) ========================")
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fmt.Println("First name:", person.firstName)
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fmt.Println("Last name: ", person.lastName)
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fmt.Println("Birthday: ", person.birthday)
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}
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