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