New features

+ Add check for straight flush
+ Add check for four of a kind
+ Add launch.json

.vscode/launch.json

@@ -0,0 +1,45 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'cards'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=cards",
+                    "--package=cards"
+                ],
+                "filter": {
+                    "name": "cards",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'cards'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=cards",
+                    "--package=cards"
+                ],
+                "filter": {
+                    "name": "cards",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

src/main.rs

@@ -1,8 +1,9 @@
 use rand::Rng;
+use std::collections::HashMap;
 use std::fmt;
 use std::vec;
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Eq, PartialEq)]
 enum CardSuit {
     Diamonds,
     Clubs,
@@ -15,6 +16,59 @@ struct PlayingCard {
     suit: CardSuit,
 }
 
+fn is_straight_flush(hand: &Vec<PlayingCard>) -> bool {
+    assert!(hand.len() == 5);
+
+    let suit = hand[0].suit;
+    let mut min_val = 15;
+    let mut max_val = 1;
+
+    // Must all be the same suit
+    for i in 0..5 {
+        let card = &hand[i];
+
+        for k in (i + 1)..5 {
+            if hand[k].value == card.value {
+                return false;
+            }
+        }
+
+        if card.value < min_val {
+            min_val = card.value;
+        };
+
+        if card.value > max_val {
+            max_val = card.value;
+        }
+
+        if card.suit != suit {
+            return false;
+        }
+    }
+
+    if max_val - min_val > 4 {
+        return false;
+    }
+
+    true
+}
+
+fn is_four_of_a_kind(hand: &Vec<PlayingCard>) -> bool {
+    let mut count: HashMap<u8, u8> = HashMap::new();
+
+    for card in hand {
+        *count.entry(card.value).or_insert(0) += 1;
+    }
+
+    for e in count {
+        if e.1 == 4 {
+            return true;
+        }
+    }
+
+    false
+}
+
 impl fmt::Display for PlayingCard {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let val = match self.value {
@@ -73,9 +127,28 @@ fn create_deck() -> Vec<PlayingCard> {
 fn main() {
     let mut deck = create_deck();
 
-    let card1 = draw_card(&mut deck);
-    let card2 = draw_card(&mut deck);
+    let card1: PlayingCard = PlayingCard {
+        suit: CardSuit::Clubs,
+        value: 2,
+    };
+    let card2: PlayingCard = PlayingCard {
+        suit: CardSuit::Clubs,
+        value: 2,
+    };
+    let card3: PlayingCard = PlayingCard {
+        suit: CardSuit::Clubs,
+        value: 2,
+    };
+    let card4: PlayingCard = PlayingCard {
+        suit: CardSuit::Clubs,
+        value: 2,
+    };
+    let card5: PlayingCard = PlayingCard {
+        suit: CardSuit::Clubs,
+        value: 3,
+    };
 
-    println!("Card 1: {}", card1);
-    println!("Card 2: {}", card2);
+    let hand = vec![card1, card2, card3, card4, card5];
+
+    println!("{}", is_four_of_a_kind(&hand));
 }