add: arrays

14-arrays/12-compare-unnamed/main.go

@@ -0,0 +1,63 @@
+// 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{}
+}