Yahtzee

Instructions

The game of Yahtzee is a simple dice game. Each round, each player rolls five six-sided dice. The player may choose to reroll some or all of the dice up to three times (including the original roll). The player then places the roll in a category, such as ones, twos, sixes, pair, two pairs, etc. If the roll is compatible with the category, the player gets a score for this roll according to the rules. If the roll is not compatible, the player gets a score of zero for this roll.

The kata consists of creating the rules to score a roll in any predefined category. Given a roll and a category, the final solution should output the score for this roll placed in this category.

Rules

The following categories exist:

• Ones, Twos, Threes, Fours, Fives, Sixes: The player scores the sum of the dice that read one, two, three, four, five or six, respectively. For example, 1, 1, 2, 4, 4 placed on "fours" gives 8 points.
• Pair: The player scores the sum of the two highest matching dice. For example, 3, 3, 3, 4, 4 placed on "pair" gives 8.
• Two pairs: If there are two pairs of dice with the same number, the player scores the sum of these dice. If not, the player scores 0. For example, 1, 1, 2, 3, 3 placed on "two pairs" gives 8.
• Three of a kind: If there are three dice with the same number, the player scores the sum of these dice. Otherwise, the player scores 0. For example, 3, 3, 3, 4, 5 placed on "three of a kind" gives 9.
• Four of a kind: If there are four dice with the same number, the player scores the sum of these dice. Otherwise, the player scores 0. For example, 2, 2, 2, 2, 5 placed on "four of a kind" gives 8.
• Small straight: If the dice read 1,2,3,4,5, the player scores 15 (the sum of all the dice), otherwise 0.
• Large straight: If the dice read 2,3,4,5,6, the player scores 20 (the sum of all the dice), otherwise 0.
• Full house: If the dice are two of a kind and three of a kind, the player scores the sum of all the dice. For example, 1,1,2,2,2 placed on "full house" gives 8. 4,4,4,4,4 is not "full house".
• Yahtzee: If all dice have the same number, the player scores 50 points, otherwise 0.
• Chance: The player gets the sum of all dice, no matter what they read.

Solutions

• Kotlin by Nicolás Bottarini

Credits

• Coding Dojo