Initial commit

first/explain/comments/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 makes this package an executable program
+package main
+
+import "fmt"
+
+/*
+main function
+Go executes this program using this function.
+There should be only one main file in a main package.
+Executable programs are also called as "commands".
+*/
+func main() {
+	fmt.Println("Hello Gopher!")
+}

first/explain/expressions/01-operator/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!" + "!")
+}

first/explain/expressions/02-call-expression/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"
+	"runtime"
+)
+
+func main() {
+	// runtime.NumCPU() is a call expression
+	fmt.Println(runtime.NumCPU() + 1)
+}

first/explain/expressions/README

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+I've moved the main.go file for the expressions coding lecture into:
+
+02-call-expression/

first/explain/importing/01-file-scope/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!")
+}

first/explain/importing/02-renaming/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"
+import f "fmt"
+
+func main() {
+	fmt.Println("Hello!")
+	f.Println("There!")
+}

first/explain/packages/scopes/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/scopes/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/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
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello!")
+
+	// two files belong to the same package
+	// calling `bye()` of bye.go here
+	bye()
+}
+
+// EXERCISE: Remove the comments from the below function
+//           And analyze the error message
+
+// func bye() {
+// 	fmt.Println("Bye!")
+// }
+
+// ***** EXPLANATION *****
+//
+// ERROR: "bye" function "redeclared"
+//        in "this block"
+//
+// "this block" means = "main package"
+//
+// "redeclared" means = you're using the same name
+//   in the same scope again
+//
+// main package's scope is:
+// all source-code files which are in the same main package

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()
+}

first/explain/scopes/01-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
+
+// file scope
+import "fmt"
+
+// package scope
+const ok = true
+
+// package scope
+func main() { // block scope starts
+
+	var hello = "Hello"
+
+	// hello and ok are visible here
+	fmt.Println(hello, ok)
+
+} // block scope ends

first/explain/scopes/02-block-scope/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
+
+func nope() { // block scope starts
+
+	// hello and ok are only visible here
+	const ok = true
+	var hello = "Hello"
+
+	_ = hello
+} // block scope ends
+
+func main() { // block scope starts
+
+	// hello and ok are not visible here
+
+	// ERROR:
+	// fmt.Println(hello, ok)
+
+} // block scope ends

first/explain/scopes/03-nested-scope/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"
+
+// I didn't talk about this in a lecture
+// As a side-note, I wanted to put it here
+// Please review it.
+
+var declareMeAgain = 10
+
+func nested() { // block scope starts
+
+	// declares the same variable
+	// they both can exist together
+	// this one only belongs to this scope
+	// package's variable is still intact
+	var declareMeAgain = 5
+	fmt.Println("inside nope:", declareMeAgain)
+
+} // block scope ends
+
+func main() { // block scope starts
+
+	fmt.Println("inside main:", declareMeAgain)
+
+	nested()
+
+	// package-level declareMeAgain isn't effected
+	// from the change inside the nested func
+	fmt.Println("inside main:", declareMeAgain)
+
+} // block scope ends

first/explain/statements/01-execution-flow/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!")
+
+	// Statements change the execution flow
+	// Especially the control flow statements like `if`
+	if 5 > 1 {
+		fmt.Println("bigger")
+	}
+}

first/explain/statements/02-semicolons/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"); fmt.Println("World!")
+}