58 lines
1.3 KiB
Dart
58 lines
1.3 KiB
Dart
class BowlingGame {
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static const _totalFrames = 10;
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static const _allPins = 10;
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static const _rollsInNormalFrame = 2;
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static const _rollsInStrike = 1;
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final List<int> _rolls = [];
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void roll(int pins) => _rolls.add(pins);
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int score() {
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int total = 0;
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int rollIndex = 0;
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for (int frame = 0; frame < _totalFrames; frame++) {
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if (_isStrike(rollIndex)) {
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total += _strikeScore(rollIndex);
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rollIndex += _rollsInStrike;
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} else if (_isSpare(rollIndex)) {
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total += _spareScore(rollIndex);
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rollIndex += _rollsInNormalFrame;
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} else {
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total += _normalScore(rollIndex);
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rollIndex += _rollsInNormalFrame;
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}
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}
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return total;
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}
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int _strikeScore(int rollIndex) {
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return _allPins + _nextTwoRollsBonus(rollIndex);
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}
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int _spareScore(int rollIndex) {
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return _allPins + _nextRollBonus(rollIndex);
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}
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int _normalScore(int rollIndex) {
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return _rolls[rollIndex] + _rolls[rollIndex + 1];
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}
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int _nextTwoRollsBonus(int rollIndex) {
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return _rolls[rollIndex + 1] + _rolls[rollIndex + 2];
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}
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int _nextRollBonus(int rollIndex) {
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return _rolls[rollIndex + 2];
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}
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bool _isSpare(int rollIndex) {
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return _rolls[rollIndex] + _rolls[rollIndex + 1] == _allPins;
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}
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bool _isStrike(int rollIndex) {
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return _rolls[rollIndex] == _allPins;
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}
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}
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