restructure: arrays and slices

16-slices/exercises/01-declare-nil/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: Declare nil slices
+//
+//  1. Declare the following slices as nil slices:
+//
+//    1. The names of your friends (names slice)
+//
+//    2. The distances to locations (distances slice)
+//
+//    3. A data buffer (data slice)
+//
+//    4. Currency exchange ratios (ratios slice)
+//
+//    5. Up/Down status of web servers (alives slice)
+//
+//
+//  2. Print their type, length and whether they're equal to nil value or not.
+//
+//
+// EXPECTED OUTPUT
+//  names    : []string 0 true
+//  distances: []int 0 true
+//  data     : []uint8 0 true
+//  ratios   : []float64 0 true
+//  alives   : []bool 0 true
+// ---------------------------------------------------------
+
+func main() {
+}

16-slices/exercises/01-declare-nil/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 (
+		names     []string  // The names of your friends
+		distances []int     // The distances
+		data      []byte    // A data buffer
+		ratios    []float64 // Currency exchange ratios
+		alives    []bool    // Up/Down status of web servers
+	)
+
+	fmt.Printf("names    : %T %d %t\n", names, len(names), names == nil)
+	fmt.Printf("distances: %T %d %t\n", distances, len(distances), distances == nil)
+	fmt.Printf("data     : %T %d %t\n", data, len(data), data == nil)
+	fmt.Printf("ratios   : %T %d %t\n", ratios, len(ratios), ratios == nil)
+	fmt.Printf("alives   : %T %d %t\n", alives, len(alives), alives == nil)
+}