Submission Details
Severity:
Excessive Use of Magic Numbers
Summary
The contract contains multiple hardcoded numeric values ("magic numbers") without clear documentation or constant definitions. These numbers are used for game logic, card calculations, and ETH values, making the code less maintainable and more prone to errors.
Impact
Reduced code readability
Harder to maintain and modify
Increased risk of errors when updating values
Lack of clarity about the business logic
Proof of Concept
for (uint256 i = 1; i <= 52; i++) { // Magic number: 52 cards
availableCards[player].push(i);
}
uint256 standThreshold = (randomValue % 5) + 17; // Magic numbers: 5, 17
if (dealerHand > 21) { // Magic number: 21
// ...
}
payable(player).transfer(2 ether); // Magic number: 2 ether
Recommendations
Add constant to the contract
+ uint256 private constant DECK_SIZE = 52;
+ uint256 private constant BLACKJACK_VALUE = 21;
+ uint256 private constant MIN_DEALER_STAND = 17;
+ uint256 private constant DEALER_STAND_RANGE = 5;
// Payment constants
+ uint256 private constant REQUIRED_BET = 1 ether;
+ uint256 private constant WINNING_PAYOUT = 2 ether;
// Card constants
+ uint256 private constant FACE_CARD_VALUE = 10;
+ uint256 private constant CARDS_PER_SUIT = 13;
Rewards breakdown
nSLOC
147This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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