restructure: arrays and slices

16-slices/exercises/03-slice-literal/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: Assign slice literals
+//
+//   1. Assign the following data using slice literals to the slices that
+//      you've declared in the first exercise.
+//
+//    1. The names of your best three friends (to the names slice)
+//
+//    2. The distances to five different locations (to the distances slice)
+//
+//    3. Five bytes of data (to the data slice)
+//
+//    4. Two currency exchange ratios (to the ratios slice)
+//
+//    5. Up/Down status of four different web servers (to the alives slice)
+//
+//  2. Print their type, length and whether they're equal to nil value or not
+//
+//  3. Compare the length of the distances and the data slices; print a message
+//     if they are equal (use an if statement).
+//
+//
+// EXPECTED OUTPUT
+//  names    : []string 3 false
+//  distances: []int 5 false
+//  data     : []uint8 5 false
+//  ratios   : []float64 2 false
+//  alives   : []bool 4 false
+//  The length of the distances and the data slices are the same.
+// ---------------------------------------------------------
+
+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
+	)
+
+	names = []string{}
+	distances = []int{}
+	data = []byte{}
+	ratios = []float64{}
+	alives = []bool{}
+
+	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)
+}