tdd-katas

Katas using Groovy and Spock

Build Version Comparator Kata

Comparator that compares two build version values. Build versions are made of some numbers separated by dots.

For example:

• 1
• 1.3.1
• 2.0.178.14.10

FizzBuzz Kata

Program that prints the numbers from 1 to 100. Instead of numbers for multiples of three prints "Fizz", for the multiples of five prints "Buzz" and for multiples of both three and five prints "FizzBuzz".

Anagrams Kata

http://codekata.com/kata/kata06-anagrams/

Find the longest words that are anagrams, and find the set of anagrams containing the most words.

String Calculator Kata

String calculator with a method int add(string numbers). The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0). For example:

• ""
• "1"
• "1,2"

Allow to handle an unknown amount of numbers. Allow to handle new lines between numbers (instead of commas). For example:

• "1\n2,3" (will equal 6)
• "1,\n" (is NOT ok)

Support different delimiters.

Bowling Game Kata

Uncle Bob’s Bowling Game Kata

The game consists of 10 frames as shown above. In each frame the player has two opportunities to knock down 10 pins. The score for the frame is the total number of pins knocked down, plus bonuses for strikes and spares.

A spare is when the player knocks down all 10 pins in two tries. The bonus for that frame is the number of pins knocked down by the next roll. So in frame 3 above, the score is 10 (the total number knocked down) plus a bonus of 5 (the number of pins knocked down on the next roll.)

A strike is when the player knocks down all 10 pins on his first try. The bonus for that frame is the value of the next two balls rolled.

In the tenth frame a player who rolls a spare or strike is allowed to roll the extra balls to complete the frame. However no more than three balls can be rolled in tenth frame.

Requirements

Write a class named "Game" that has two methods:

• roll(pins : int) is called each time the player rolls a ball. The argument is the number of pins knocked down.
• score() : int is called only at the very end of the game. It returns the total score for that game.

Counting Code Lines Kata

http://codekata.com/kata/kata13-counting-code-lines/

Roman Numerals Kata

Convert Arabic numbers ( 1, 2, 3, 4, 5, etc.) into Roman equivalents: I, II, III, IV, V, etc.

Prime Factors Kata

Write a class named "PrimeFactors" that has one static method: generate. The generate method takes an integer argument and returns a collection of integers. That list contains the prime factors in numerical sequence.

Game of Life Kata

The Game of Life is a mathematical “zero-player” game devised by John Conway. It simulates the behavior of populations following simple rules. Life is played on a grid of cells. Each cell can be either alive or dead. The game progresses in a series of iterations, called generations. In each generation, the value of a cell (whether it is alive or dead) is determined by the value of that cell and its neighbors in the previous generation using the following rules:

• If a living cell has less than 2 living neighbors, it will die (of loneliness).
• If a living cell has more than 3 living neighbors, it will die (it’s overcrowded).
• If a dead cell has exactly 3 living neighbors, it will come to life (it is born).
• Otherwise, the cell’s value will not be changed.

For more information see the Wikipedia article.

OddEven Kata

For a specified range of numbers, eg. from 1 to 100:

• if number is odd (divisible by 2 but not divisible by itself), print 'Odd' instead of the number
• if number is even (divisible by 2), print 'Even' instead of number
• else if number is prime (does not meet above two conditions), print number

Tic Tac Toe Kata

Tic-tac-toe is a game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.

For more information see the Wikipedia article.

Tennis Game Kata

In a game of tennis, a player starts with a score of 0 and earns more points in this sequence:

0, 15, 30, 40, win

If a player has 40 and scores again that player wins the game as long as the other player does not also have 40 points. If both players reach 40 points it is referred to as "deuce".

Scoring during deuce gives a player advantage. If the other player scores again the score returns to deuce. If a player has advantage and scores again, that player wins the game.

Percent Encoder Kata

For more information see Wikipedia article.

Berlin Clock Kata

For more information see Wikipedia article.

Percent Encoder Kata

For more information see Wikipedia article.

Reverse Polish Notation Kata

In reverse Polish notation the operators follow their operands; for instance, to add 3 and 4, one would write "3 4 +" rather than "3 + 4". If there are multiple operations, the operator is given immediately after its second operand; so the expression written "3 − 4 + 5" in conventional notation would be written "3 4 − 5 +" in RPN: 4 is first subtracted from 3, then 5 added to it. An advantage of RPN is that it removes the need for parentheses that are required by infix. While "3 − 4 × 5" can also be written "3 − (4 × 5)", that means something quite different from "(3 − 4) × 5". In postfix, the former could be written "3 4 5 × −", which unambiguously means "3 (4 5 ×) −" which reduces to "3 20 −"; the latter could be written "3 4 − 5 ×" (or 5 3 4 − ×, if keeping similar formatting), which unambiguously means "(3 4 −) 5 ×".

For more information see Wikipedia article.