import scala.util.Random
/*
A standard deck of 52 playing cards consists of four suits:
spades (♠), hearts (♥), diamonds (♦), and clubs (♣).
Each suit contains 13 ranks:
Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King.
Cards of spades and clubs are black, while hearts and diamonds are red.
Color is informational only — it does not affect shuffling or random selection.
*/
/*
This program picks 5 random cards from a standard 52‑card deck.
It uses:
- List[String] to store ranks, suits, and the deck
- Random.shuffle for efficient randomization
- Pure functions for clarity and idiomatic Scala
Algorithm:
1. Build the deck (52 strings).
2. Shuffle using Random.shuffle.
3. Print the first 5 cards.
*/
def buildDeck(): List[String] = {
val ranks: List[String] = List("2","3","4","5","6","7","8","9","10","J","Q","K","A")
val suits: List[String] = List("Clubs", "Diamonds", "Hearts", "Spades")
// Combine each rank with each suit → 52 unique cards
for {
suit <- suits
rank <- ranks
} yield s"$rank of $suit"
}
def shuffleDeck(deck: List[String]): List[String] = {
// Random.shuffle uses Fisher–Yates internally
Random.shuffle(deck)
}
def main(args: Array[String]): Unit = {
// Step 1: Build the deck
val deck: List[String] = buildDeck()
// Step 2: Shuffle the deck
val shuffled: List[String] = shuffleDeck(deck)
// Step 3: Draw the first 5 cards
println("Your 5 random cards:")
shuffled.take(5).foreach(println)
}
/*
run:
Your 5 random cards:
9 of Hearts
10 of Diamonds
5 of Spades
4 of Spades
K of Clubs
*/
