Initial commit

06-variables/04-assignment/01-assignment/01-assignment/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() {
+	var speed int
+	fmt.Println(speed)
+
+	speed = 100
+	fmt.Println(speed)
+
+	speed = speed - 25
+	fmt.Println(speed)
+}

06-variables/04-assignment/01-assignment/02-strongly-typed/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
+
+// Go is a strongly typed programming language.
+
+// Even a float and an integer are different types.
+// Or: int32 and int are different types.
+
+// EXERCISE: Try uncommenting the lines
+//           And observe the errors
+
+func main() {
+	var speed int
+	// speed = "100"
+
+	var running bool
+	// running = 1
+
+	var force float64
+	// speed = force
+
+	// Go automatically converts the typeless
+	//   integer literal to float64 automatically
+	force = 1
+
+	// keep the compiler happy
+	_, _, _ = speed, running, force
+}

06-variables/04-assignment/01-assignment/03-examples/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() {
+	var (
+		name   string
+		age    int
+		famous bool
+	)
+
+	// Example #1
+	name = "Newton"
+	age = 84
+	famous = true
+
+	fmt.Println(name, age, famous)
+
+	// Example #2
+	name = "Somebody"
+	age = 20
+	famous = false
+
+	fmt.Println(name, age, famous)
+
+	// Example #3
+	// EXERCISE: Why this doesn't work? Think about it.
+
+	// name = 20
+	// name = age
+
+	// save the previous value of the variable
+	// to a new variable
+	var prevName string
+	prevName = name
+
+	// overwrite the value of the original variable
+	// by assigning to it
+	name = "Einstein"
+
+	fmt.Println("previous name:", prevName)
+	fmt.Println("current name :", name)
+}

06-variables/04-assignment/01-overview/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() {
+	var counter int
+
+	fmt.Println("counter's name : counter")
+	fmt.Println("counter's value:", counter)
+	fmt.Printf("counter's type : %T\n", counter)
+
+	counter = 10 // OK
+	// counter = "ten" // NOT OK
+
+	fmt.Println("counter's value:", counter)
+
+	counter++
+	fmt.Println("counter's value:", counter)
+}

06-variables/04-assignment/05-multiple-assignment/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"
+	"time"
+)
+
+func main() {
+	var (
+		speed int
+		now   time.Time
+	)
+
+	speed, now = 100, time.Now()
+
+	fmt.Println(speed, now)
+
+	// EXERCISE:
+	//   Try this alternative (formatted time).
+
+	// fmt.Println(speed, now.Format(time.Kitchen))
+}

06-variables/04-assignment/06-swapping/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() {
+	var (
+		speed     = 100
+		prevSpeed = 50
+	)
+
+	speed, prevSpeed = prevSpeed, speed
+
+	fmt.Println(speed, prevSpeed)
+}

06-variables/04-assignment/07-path-project/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"
+	"path"
+)
+
+func main() {
+	var dir, file string
+
+	dir, file = path.Split("css/main.css")
+
+	fmt.Println("dir :", dir)
+	fmt.Println("file:", file)
+}

06-variables/04-assignment/08-path-project-discarding/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"
+	"path"
+)
+
+func main() {
+	var file string
+
+	_, file = path.Split("css/main.css")
+
+	fmt.Println("file:", file)
+}

06-variables/04-assignment/09-path-project-shortdecl/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"
+	"path"
+)
+
+func main() {
+	_, file := path.Split("css/main.css")
+
+	// or this:
+	// dir, file := path.Split("css/main.css")
+
+	fmt.Println("file:", file)
+}

06-variables/04-assignment/exercises/01/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- Change `color` variable's value to "blue"
+//
+//  2- Print it
+//
+// EXPECTED OUTPUT
+//  blue
+// ---------------------------------------------------------
+
+func main() {
+	// DON'T TOUCH THIS:
+
+	// color := "green"
+
+	// ADD YOUR CODE BELOW:
+
+	// ?
+}

06-variables/04-assignment/exercises/01/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() {
+	color := "green"
+
+	color = "blue"
+
+	fmt.Println(color)
+}

06-variables/04-assignment/exercises/02/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- Change the value of `color` variable to "dark green"
+//
+//  2- Do not assign "dark green" to `color` directly
+//
+//     Instead, use the `color` variable again
+//     while assigning to `color`
+//
+//  3- Print it
+//
+// RESTRICTIONS
+//   WRONG ANSWER, DO NOT DO THIS:
+//   `color = "dark green"`
+//
+// HINT
+//   + operator can concatenate string values
+//
+//   Example:
+//   "h" + "e" + "y" returns "hey"
+//
+// EXPECTED OUTPUT
+//  dark green
+// ---------------------------------------------------------
+
+func main() {
+	// DON'T TOUCH THIS
+
+	// color := "green"
+
+	// ADD YOUR CODE BELOW
+
+	// ?
+
+	// UNCOMMENT THE CODE BELOW TO PRINT THE VARIABLE
+
+	// fmt.Println(color)
+}

06-variables/04-assignment/exercises/02/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() {
+	color := "green"
+
+	// `"dark " + color` is an expression
+
+	color = "dark " + color
+
+	fmt.Println(color)
+}

06-variables/04-assignment/exercises/03/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"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1- Multiply 3.14 with 2 and assign it to `n` variable
+//
+//  2- Print the `n` variable
+//
+// HINT
+//  Example: 3 * 2 = 6
+//  * is the product operator (it multiplies numbers)
+//
+// EXPECTED OUTPUT
+//  6.28
+// ---------------------------------------------------------
+
+func main() {
+	// DON'T TOUCH THIS
+
+	// Declares a new float64 variable
+	// 0. means 0.0
+	n := 0.
+
+	// ADD YOUR CODE BELOW
+
+	// ?
+
+	fmt.Println(n)
+}

06-variables/04-assignment/exercises/03/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() {
+	n := 0.
+
+	n = 3.14 * 2
+
+	fmt.Println(n)
+}

06-variables/04-assignment/exercises/04/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- Find the length of a rectangle
+//     Its width is  5
+//     Its height is 6
+//
+//  2- Assign the result to the `length` variable
+//
+//  3- Print the `length` variable
+//
+// HINT
+//  Rectangle formula = 2 * (width + height)
+//
+// EXPECTED OUTPUT
+//  22
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT CHANGE THIS
+
+	// var (
+	// 	length        int
+	// 	width, height = 5, 6
+	// )
+
+	// USE THE VARIABLES ABOVE WHEN CALCULATING YOUR RESULT
+
+	// ADD YOUR CODE BELOW
+}

06-variables/04-assignment/exercises/04/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() {
+	var (
+		length        int
+		width, height = 5, 6
+	)
+
+	// first calculates: (width + height)
+	// then            :  multiplies it with 2
+
+	// just like in math
+
+	length = 2 * (width + height)
+
+	fmt.Println(length)
+}

06-variables/04-assignment/exercises/05/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"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1- Assign "go" to `lang` variable
+//     and assign 2 to `version` variable
+//     using a multiple assignment statement
+//
+//  2- Print the variables
+//
+// EXPECTED OUTPUT
+//  go version 2
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT TOUCH THIS
+	var (
+		lang    string
+		version int
+	)
+
+	// ADD YOUR CODE BELOW
+
+	// DO NOT TOUCH THIS
+	fmt.Println(lang, "version", version)
+}

06-variables/04-assignment/exercises/05/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() {
+	var (
+		lang    string
+		version int
+	)
+
+	lang, version = "go", 2
+
+	fmt.Println(lang, "version", version)
+}

06-variables/04-assignment/exercises/06/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- Assign the correct values to the variables
+//     to match to the EXPECTED OUTPUT below
+//
+//  2- Print the variables
+//
+// HINT
+//  Use multiple Println calls to print each sentence.
+//
+// EXPECTED OUTPUT
+//  Air is good on Mars
+//  It's true
+//  It is 19.5 degrees
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT TOUCH THIS
+
+	// var (
+	// 	planet string
+	// 	isTrue bool
+	// 	temp   float64
+	// )
+
+	// ADD YOUR CODE BELOW
+}

06-variables/04-assignment/exercises/06/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() {
+	var (
+		planet string
+		isTrue bool
+		temp   float64
+	)
+
+	planet, isTrue, temp = "Mars", true, 19.5
+
+	fmt.Println("Air is good on", planet)
+	fmt.Println("It's", isTrue)
+	fmt.Println("It is", temp, "degrees")
+}

06-variables/04-assignment/exercises/07/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- Multiple short declare two variables
+//
+//  2- Initialize variables using `multi` function below
+//
+//  3- Discard the 1st variable's value in the declaration
+//
+//  4- Print only the 2nd variable
+//
+// NOTE
+//  You should use `multi` function
+//  while initializing the variables
+//
+// EXPECTED OUTPUT
+//  4
+// ---------------------------------------------------------
+
+func main() {
+	// ADD YOUR DECLARATIONS HERE
+	//
+
+	// THEN UNCOMMENT THE CODE BELOW
+
+	// fmt.Println(b)
+}
+
+// multi is a function that returns multiple int values
+func multi() (int, int) {
+	return 5, 4
+}

06-variables/04-assignment/exercises/07/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() {
+	_, b := multi()
+
+	fmt.Println(b)
+}
+
+func multi() (int, int) {
+	return 5, 4
+}

06-variables/04-assignment/exercises/08/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- Change `color` to "orange"
+//     and `color2` to "green" at the same time
+//
+//     (use multiple-assignment)
+//
+//  2- Print the variables
+//
+// EXPECTED OUTPUT
+//  orange green
+// ---------------------------------------------------------
+
+func main() {
+	// color, color2 := "red", "blue"
+
+	// ?
+}

06-variables/04-assignment/exercises/08/solution/main.go

@@ -0,0 +1,18 @@
+// 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() {
+	color, color2 := "red", "blue"
+
+	color, color2 = "orange", "green"
+
+	fmt.Println(color, color2)
+}

06-variables/04-assignment/exercises/09/main.go

@@ -0,0 +1,23 @@
+// 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- Swap the values of `red` and `blue` variables
+//
+//  2- Print them
+//
+// EXPECTED OUTPUT
+//  blue red
+// ---------------------------------------------------------
+
+func main() {
+	// red, blue := "red", "blue"
+	// ?
+}

06-variables/04-assignment/exercises/09/solution/main.go

@@ -0,0 +1,18 @@
+// 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() {
+	red, blue := "red", "blue"
+
+	red, blue = blue, red
+
+	fmt.Println(red, blue)
+}

06-variables/04-assignment/exercises/10/main.go

@@ -0,0 +1,25 @@
+// 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
+//  Print only the directory using `path.Split`
+//
+//  Discard the file part
+//
+// RESTRICTION
+//  Use short declaration
+//
+// EXPECTED OUTPUT
+//  secret/
+// ---------------------------------------------------------
+
+func main() {
+	// ? ?= path.Split("secret/file.txt")
+}

06-variables/04-assignment/exercises/10/solution/main.go

@@ -0,0 +1,19 @@
+// 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"
+	"path"
+)
+
+func main() {
+	dir, _ := path.Split("secret/file.txt")
+
+	fmt.Println(dir)
+}

06-variables/04-assignment/questions/questions.md

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+## What happens when you assign a variable to another variable?
+* The variables become the same variable
+* Assignee variable gets deleted
+* Variable's value is changed to the assigned variable's value *CORRECT*
+
+## Which one is a correct assignment statement?
+```go
+opened := true
+```
+* `closed := true`
+* `opened = false` *CORRECT*
+* `var x = 2`
+
+## Which one is a correct assignment statement?
+* `a, b = 3; 5`
+* `c, d = true, false` *CORRECT*
+* `a, b, c = 5, 3`
+
+## Which one is a correct assignment?
+```go
+var (
+  n = 3
+  m int
+)
+```
+
+* `m = "4"`
+* `n = 10` *CORRECT*
+* `n = true`
+* `m = false`
+
+## Which one is a correct assignment?
+```go
+var (
+  n = 3
+  m int
+  f float64
+)
+```
+
+* `n, m = 4, f`
+* `n = false`
+* `n, m = m + n, n + 5.0` *CORRECT*
+* `n, m = 3.82, "hi"`
+
+## Which one is a correct assignment statement?
+```go
+var (
+  a int
+  c bool
+)
+```
+* `a = _`
+* `c, _ = _, false` *CORRECT*
+* `_, _ = true, true`
+
+## Which one is a correct assignment?
+**REMEMBER:** `path.Split` returns two `string` values
+
+```go
+  var c, f string
+```
+* `_ = path.Split("assets/profile.png")`
+* `_, _, c = path.Split("assets/profile.png")`
+* `f = path.Split("assets/profile.png")`
+* `_, f = path.Split("assets/profile.png")` *CORRECT*