Initial commit

first/explain/packages/what/bye.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 bye() {
+	fmt.Println("Bye!")
+}

first/explain/packages/what/hey.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 hey() {
+	fmt.Println("Hey!")
+}

first/explain/packages/what/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() {
+	fmt.Println("Hello!")
+
+	// You can access functions from other files
+	// which are in the same package
+
+	// Here, `main()` can access `bye()` and `hey()`
+
+	// It's because: bye.go, hey.go and main.go
+	//   are in the main package.
+
+	bye()
+	hey()
+}