add: moodly challenges docs

14-arrays/10-challenge-moodly-2/challenge/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"
+	"math/rand"
+	"os"
+	"time"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Moodly #2
+//
+//   This challenge is based on the previous Moodly challenge.
+//
+//   1. Display the usage if the username or the mood is missing
+//
+//   2. Change the moods array to a multi-dimensional array.
+//
+//      So, create two inner arrays:
+//        1. One for positive moods
+//        2. Another one for negative moods
+//
+//   4. Randomly select and print one of the mood messages depending
+//      on the given mood command-line argument.
+//
+// EXPECTED OUTPUT
+//
+//   go run main.go
+//     [your name] [positive|negative]
+//
+//   go run main.go Socrates
+//     [your name] [positive|negative]
+//
+//   go run main.go Socrates positive
+//     Socrates feels good 👍
+//
+//   go run main.go Socrates positive
+//     Socrates feels happy 😀
+//
+//   go run main.go Socrates positive
+//     Socrates feels awesome 😎
+//
+//   go run main.go Socrates negative
+//     Socrates feels bad 👎
+//
+//   go run main.go Socrates negative
+//     Socrates feels sad 😞
+//
+//   go run main.go Socrates negative
+//     Socrates feels terrible 😩
+// ---------------------------------------------------------
+
+func main() {
+	args := os.Args[1:]
+	if len(args) != 1 {
+		fmt.Println("[your name]")
+		return
+	}
+
+	name := args[0]
+
+	moods := [...]string{
+		"happy 😀", "good 👍", "awesome 😎",
+		"sad 😞", "bad 👎", "terrible 😩",
+	}
+
+	rand.Seed(time.Now().UnixNano())
+	n := rand.Intn(len(moods))
+
+	fmt.Printf("%s feels %s\n", name, moods[n])
+}