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03-packages-and-scopes/exercises/02-scopes/main.go

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+// 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
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Create two files: main.go and printer.go
+//
+//  2. In printer.go:
+//     1. Create a function named hello
+//     2. Inside the hello function, print your name
+//
+//  3. In main.go:
+//     1. Create the usual func main
+//     2. Call your function just by using its name: hello
+//     3. Create a function named bye
+//     4. Inside the bye function, print "bye bye"
+//
+//  4. In printer.go:
+//     1. Call the bye function from
+//        inside the hello function
+//
+//  5. In main.go:
+//     1.
+// ---------------------------------------------------------
+
+func main() {
+}

03-packages-and-scopes/exercises/02-scopes/solution/main.go

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+// 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() {
+	// as you can see, I don't need to import a package
+	// and I can call `hello` function here.
+	//
+	// this is because, package-scoped names
+	//   are shared in the same package
+	hello()
+
+	// but here, i can't access the fmt package without
+	// importing it.
+	//
+	// this is because, it's in the printer.go's file scope.
+	// it imports it.
+
+	// this main func can also call bye function here
+	// bye()
+}
+
+// printer.go can call this function
+//
+// this is because, bye function is in the package-scope
+// of the main package now.
+//
+// main func can also call this.
+func bye() {
+	fmt.Println("bye bye")
+}

03-packages-and-scopes/exercises/02-scopes/solution/printer.go

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+// 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 hello() {
+	// only this file can access the imported fmt package
+	// when others also do so, they can also access
+	//   their own `fmt` "name"
+
+	fmt.Println("hi! this is inanc!")
+	bye()
+}