64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
// For more tutorials: https://blog.learngoprogramming.com
|
|
//
|
|
// Copyright © 2018 Inanc Gumus
|
|
// Learn Go Programming Course
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
|
//
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
// STORY:
|
|
// You want to compare two bookcases,
|
|
// whether they're equal or not.
|
|
|
|
func main() {
|
|
type (
|
|
// integer int
|
|
|
|
bookcase [5]int
|
|
cabinet [5]int
|
|
// ^- try changing this to: integer
|
|
// but first: uncomment the integer type above
|
|
)
|
|
|
|
blue := bookcase{6, 9, 3, 2, 1}
|
|
red := cabinet{6, 9, 3, 2, 1}
|
|
|
|
fmt.Print("Are they equal? ")
|
|
|
|
if cabinet(blue) == red {
|
|
fmt.Println("✅")
|
|
} else {
|
|
fmt.Println("❌")
|
|
}
|
|
|
|
fmt.Printf("blue: %#v\n", blue)
|
|
fmt.Printf("red : %#v\n", bookcase(red))
|
|
|
|
// ------------------------------------------------
|
|
// The underlying type of an unnamed type is itself.
|
|
//
|
|
// [5]integer's underlying type: [5]integer
|
|
// [5]int's underlying type : [5]int
|
|
//
|
|
// > [5]integer and [5]int are different types.
|
|
// > Their memory layout is not important.
|
|
// > Their types are not the same.
|
|
|
|
// _ = [5]integer{} == [5]int{}
|
|
|
|
// ------------------------------------------------
|
|
// An unnamed and a named type can be compared,
|
|
// if they've identical underlying types.
|
|
//
|
|
// [5]integer's underlying type: [5]integer
|
|
// cabinet's underlying type : [5]integer
|
|
//
|
|
// Note: Assuming the cabinet's type definition is like so:
|
|
// type cabinet [5]integer
|
|
|
|
// _ = [5]integer{} == cabinet{}
|
|
}
|