move: structs to root

24-structs/04-embedding/main.go

@@ -0,0 +1,66 @@
+// 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"
+)
+
+func main() {
+	// #1: declare the types
+	type text struct {
+		title string
+		words int
+	}
+
+	type book struct {
+		// title string
+		// words int
+
+		// #3: include the text as a field
+		// text text
+
+		// #4: embed the text
+		text
+		isbn string
+
+		// #5: add a conflicting field
+		title string
+	}
+
+	// #2: print a book
+	// moby := book{title: "moby dick", words: 206052, isbn: "102030"}
+	// fmt.Printf("%s has %d words (isbn: %s)\n", moby.title, moby.words, moby.isbn)
+
+	// #3b: type the text in its own field
+	moby := book{
+		// #5c: type the field in a new field
+		// title: "conflict",
+		text: text{title: "moby dick", words: 206052},
+		isbn: "102030",
+	}
+
+	moby.text.words = 1000
+	moby.words++
+
+	// // #4b: print the book
+	fmt.Printf("%s has %d words (isbn: %s)\n",
+		moby.title, // equals to: moby.text.title
+		moby.words, // equals to: moby.text.words
+		moby.isbn)
+
+	// #3c: print the book
+	// fmt.Printf("%s has %d words (isbn: %s)\n",
+	// 	moby.text.title, moby.text.words, moby.isbn)
+
+	// #5b: print the conflict
+	fmt.Printf("%#v\n", moby)
+
+	// go get -u github.com/davecgh/go-spew/spew
+	// spew.Dump(moby)
+}