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                         </div><div id='content' class='page-1'><div class='row'><div class='row-fluid'><div class='col-lg-3'><ul class='nav-sidebar'><li><a href='./'>Blog index</a></li><li class='active'><a href='#doc'>Deck of cards with Groovy, JDK collections and Eclipse Collections</a></li></ul><br/><ul class='nav-sidebar'><li style='padding: 0.35em 0.625em; background-color: #eee'><span>Related posts</span></li><li><a href='./deep-learning-and-eclipse-collections'>Deep Learning and Eclipse Collections</a></li><li><a href='./groovy-records'>Groovy Records</a></li><li><a href='./comparators-and-sorting-in-groovy'>Comparators and Sorting in Groovy</a></li><li><a href='./groovy-null-processing'>Groovy Processing Nulls In Lists</a></li><li><a href='./groovy-list-processing-cheat-sheet'>Groovy List Processing Cheat Sheet</a></li><li><a href='./lego-bricks-with-groovy'>Lego Bricks with Groovy</a></li><li><a href='./reading-and-writing-csv-files'>Reading and Writing CSV files with Groovy</a></li><li><a href='./using-groovy-with-apache-wayang'>Using Groovy with Apache Wayang and Apache Spark</a></li><li><a href='./groovy-haiku-processing'>Groovy Haiku processing</a></li><li><a href='./wordle-checker'>Checking Wordle with Groovy</a></li><li><a href='./zipping-collections-with-groovy'>Zipping Collections with Groovy</a></li><li><a href='./fruity-eclipse-collections'>Fruity Eclipse Collections</a></li></ul></div><div class='col-lg-8 col-lg-pull-0'><a name='doc'></a><h1>Deck of cards with Groovy, JDK collections and Eclipse Collections</h1><p><span>Author: <i>Paul King</i></span><br/><span>Published: 2022-09-23 10:18AM (Last updated: 2022-09-25 11:15AM)</span></p><hr/><div class="paragraph">
 <p>Once again, <a href="https://twitter.com/TheDonRaab">Donald Raab</a> has produced an interesting
 <a href="https://donraab.medium.com/how-to-create-a-deck-of-cards-using-eclipse-collections-d9838ac430b7">blog post</a> on
 <a href="https://github.com/eclipse/eclipse-collections">Eclipse Collections</a> this one shows some code for modelling and manipulating cards with Java 17 and Eclipse Collections. His related katas are highly recommended.
 Here is the same example in Groovy (4.0.5 was used here) with just a few tweaks:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="prettyprint highlight"><code data-lang="groovy">enum Rank { ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING }

 enum Suit { SPADES, DIAMONDS, HEARTS, CLUBS }

 @Sortable(includes='suit,rank')
 record Card(Rank rank, Suit suit) { }

 var cards = Sets.cartesianProduct(EnumSet.allOf(Rank), EnumSet.allOf(Suit), Card::new)
 var cardsBySuit = cards.groupBy(Card::suit)
 var cardsByRank = cards.groupBy(Card::rank)

 assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13 ,4]

 var random = new Random(42L)
 var deck = cards.toList().shuffleThis(random).shuffleThis(random).shuffleThis(random).toStack()
 (1..5).collect(i -&gt; deck.pop(5).toSortedList()).each(this::println)</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>And here is the output:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>[Card[rank=FOUR, suit=SPADES], Card[rank=FOUR, suit=DIAMONDS], Card[rank=SIX, suit=HEARTS], Card[rank=NINE, suit=CLUBS], Card[rank=JACK, suit=CLUBS]]
 [Card[rank=FIVE, suit=DIAMONDS], Card[rank=TWO, suit=HEARTS], Card[rank=FIVE, suit=HEARTS], Card[rank=TEN, suit=CLUBS], Card[rank=QUEEN, suit=CLUBS]]
 [Card[rank=FIVE, suit=SPADES], Card[rank=NINE, suit=SPADES], Card[rank=QUEEN, suit=SPADES], Card[rank=THREE, suit=DIAMONDS], Card[rank=TWO, suit=CLUBS]]
 [Card[rank=EIGHT, suit=SPADES], Card[rank=TWO, suit=DIAMONDS], Card[rank=EIGHT, suit=DIAMONDS], Card[rank=KING, suit=HEARTS], Card[rank=FIVE, suit=CLUBS]]
 [Card[rank=SIX, suit=SPADES], Card[rank=KING, suit=DIAMONDS], Card[rank=THREE, suit=HEARTS], Card[rank=TEN, suit=HEARTS], Card[rank=QUEEN, suit=HEARTS]]</pre>
 </div>
 </div>
 <div class="paragraph">
 <p>We can do a similar example with the built-in JDK collections and make some additional tweaks for nicer output:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="prettyprint highlight"><code data-lang="groovy">enum Rank {
     ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING
     String toString() { ['A', *'2'..'9', '10', 'J', 'Q', 'K'][ordinal()] }
 }

 enum Suit {
     SPADES, DIAMONDS, HEARTS, CLUBS
     String toString() { '♠♦♥♣'[ordinal()] }
 }

 @Sortable(includes='suit,rank')
 record Card(Rank rank, Suit suit) {
     Card(List srPair) { this(srPair[1], srPair[0]) }
     String toString() { "${rank}${suit}" }
 }

 var cards = [Suit.values(), Rank.values()].combinations().collect(Card::new)
 var cardsBySuit = cards.groupBy(Card::suit)
 var cardsByRank = cards.groupBy(Card::rank)

 assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13, 4]

 var random = new Random(42L)
 3.times { cards.shuffle(random) }
 var deck = cards as Stack
 5.times { println "Hand ${it+1}: ${(0..5).collect{ deck.pop() }.sort()}" }

 println "Remaining cards sorted:\n${deck.sort()}"</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Which has this output:</p>
 </div>
 <div class="paragraph">
 <p><span class="image"><img src="img/CardsConsole.png" alt="Cards" width="740"></span></p>
 </div>
 <div class="paragraph">
 <p>Both these Groovy examples run on JDK versions from 8 to 19<br>
 (emulated records are used in JDK versions 8 to 15).</p>
 </div>
 <div class="sidebarblock">
 <div class="content">
 <div class="title">Update history</div>
 <div class="paragraph">
 <p><strong>25/Sep/2022</strong>: Tweaked to use the same ordering for the JDK collections version.</p>
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	<p>Once again, <a href="https://twitter.com/TheDonRaab">Donald Raab</a> has produced an interesting
	<a href="https://donraab.medium.com/how-to-create-a-deck-of-cards-using-eclipse-collections-d9838ac430b7">blog post</a> on
	<a href="https://github.com/eclipse/eclipse-collections">Eclipse Collections</a> this one shows some code for modelling and manipulating cards with Java 17 and Eclipse Collections. His related katas are highly recommended.
	Here is the same example in Groovy (4.0.5 was used here) with just a few tweaks:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="prettyprint highlight"><code data-lang="groovy">enum Rank { ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING }

	enum Suit { SPADES, DIAMONDS, HEARTS, CLUBS }

	@Sortable(includes='suit,rank')
	record Card(Rank rank, Suit suit) { }

	var cards = Sets.cartesianProduct(EnumSet.allOf(Rank), EnumSet.allOf(Suit), Card::new)
	var cardsBySuit = cards.groupBy(Card::suit)
	var cardsByRank = cards.groupBy(Card::rank)

	assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13 ,4]

	var random = new Random(42L)
	var deck = cards.toList().shuffleThis(random).shuffleThis(random).shuffleThis(random).toStack()
	(1..5).collect(i -> deck.pop(5).toSortedList()).each(this::println)</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>And here is the output:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>[Card[rank=FOUR, suit=SPADES], Card[rank=FOUR, suit=DIAMONDS], Card[rank=SIX, suit=HEARTS], Card[rank=NINE, suit=CLUBS], Card[rank=JACK, suit=CLUBS]]
	[Card[rank=FIVE, suit=DIAMONDS], Card[rank=TWO, suit=HEARTS], Card[rank=FIVE, suit=HEARTS], Card[rank=TEN, suit=CLUBS], Card[rank=QUEEN, suit=CLUBS]]
	[Card[rank=FIVE, suit=SPADES], Card[rank=NINE, suit=SPADES], Card[rank=QUEEN, suit=SPADES], Card[rank=THREE, suit=DIAMONDS], Card[rank=TWO, suit=CLUBS]]
	[Card[rank=EIGHT, suit=SPADES], Card[rank=TWO, suit=DIAMONDS], Card[rank=EIGHT, suit=DIAMONDS], Card[rank=KING, suit=HEARTS], Card[rank=FIVE, suit=CLUBS]]
	[Card[rank=SIX, suit=SPADES], Card[rank=KING, suit=DIAMONDS], Card[rank=THREE, suit=HEARTS], Card[rank=TEN, suit=HEARTS], Card[rank=QUEEN, suit=HEARTS]]</pre>
	</div>
	</div>
	<div class="paragraph">
	<p>We can do a similar example with the built-in JDK collections and make some additional tweaks for nicer output:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="prettyprint highlight"><code data-lang="groovy">enum Rank {
	ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING
	String toString() { ['A', *'2'..'9', '10', 'J', 'Q', 'K'][ordinal()] }
	}

	enum Suit {
	SPADES, DIAMONDS, HEARTS, CLUBS
	String toString() { '♠♦♥♣'[ordinal()] }
	}

	@Sortable(includes='suit,rank')
	record Card(Rank rank, Suit suit) {
	Card(List srPair) { this(srPair[1], srPair[0]) }
	String toString() { "${rank}${suit}" }
	}

	var cards = [Suit.values(), Rank.values()].combinations().collect(Card::new)
	var cardsBySuit = cards.groupBy(Card::suit)
	var cardsByRank = cards.groupBy(Card::rank)

	assert [cards, cardsByRank, cardsBySuit]*.size() == [52, 13, 4]

	var random = new Random(42L)
	3.times { cards.shuffle(random) }
	var deck = cards as Stack
	5.times { println "Hand ${it+1}: ${(0..5).collect{ deck.pop() }.sort()}" }

	println "Remaining cards sorted:\n${deck.sort()}"</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Which has this output:</p>
	</div>
	<div class="paragraph">
	<p><span class="image"><img src="img/CardsConsole.png" alt="Cards" width="740"></span></p>
	</div>
	<div class="paragraph">
	<p>Both these Groovy examples run on JDK versions from 8 to 19<br>
	(emulated records are used in JDK versions 8 to 15).</p>
	</div>
	<div class="sidebarblock">
	<div class="content">
	<div class="title">Update history</div>
	<div class="paragraph">
	<p><strong>25/Sep/2022</strong>: Tweaked to use the same ordering for the JDK collections version.</p>
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