add: one more solution to 13-loops/exercises/09-lucky-number 01-first-turn-winner

13-loops/exercises/09-lucky-number-exercises/01-first-turn-winner/solution-better/main.go

@@ -0,0 +1,74 @@
+// 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"
+	"strconv"
+	"time"
+)
+
+const (
+	maxTurns = 5 // less is more difficult
+	usage    = `Welcome to the Lucky Number Game! 🍀
+
+The program will pick %d random numbers.
+Your mission is to guess one of those numbers.
+
+The greater your number is, harder it gets.
+
+Wanna play?
+`
+)
+
+func main() {
+	rand.Seed(time.Now().UnixNano())
+
+	args := os.Args[1:]
+
+	if len(args) != 1 {
+		fmt.Printf(usage, maxTurns)
+		return
+	}
+
+	guess, err := strconv.Atoi(args[0])
+	if err != nil {
+		fmt.Println("Not a number.")
+		return
+	}
+
+	if guess < 0 {
+		fmt.Println("Please pick a positive number.")
+		return
+	}
+
+	for turn := 1; turn <= maxTurns; turn++ {
+		n := rand.Intn(guess + 1)
+
+		// Better, why?
+		//
+		// Instead of nesting the if statement into
+		//   another if statement; it simply continues.
+		//
+		// TLDR: Avoid nested statements.
+		if n != guess {
+			continue
+		}
+
+		if turn == 1 {
+			fmt.Println("🥇 FIRST TIME WINNER!!!")
+		} else {
+			fmt.Println("🎉  YOU WON!")
+		}
+		return
+	}
+
+	fmt.Println("☠️  YOU LOST... Try again?")
+}