Kata

This kata is designed to test your ability to extend the functionality of built-in classes. In this case, we want you to extend the built-in Array class with the following methods: square(), cube(), average(), sum(), even() and odd().

Explanation:

• square() must return a copy of the array, containing all values squared
• cube() must return a copy of the array, containing all values cubed
• average() must return the average of all array values; on an empty array must return NaN (note: the empty array is not tested in Ruby!)
• sum() must return the sum of all array values
• even() must return an array of all even numbers
• odd() must return an array of all odd numbers

Note: the original array must not be changed in any case!

Example

var numbers = [1, 2, 3, 4, 5];

numbers.square();  // must return [1, 4, 9, 16, 25]
numbers.cube();    // must return [1, 8, 27, 64, 125]
numbers.average(); // must return 3
numbers.sum();     // must return 15
numbers.even();    // must return [2, 4]
numbers.odd();     // must return [1, 3, 5]

numbers = [1, 2, 3, 4, 5]

numbers.square()  # must return [1, 4, 9, 16, 25]
numbers.cube()    # must return [1, 8, 27, 64, 125]
numbers.average() # must return 3
numbers.sum()     # must return 15
numbers.even()    # must return [2, 4]
numbers.odd()     # must return [1, 3, 5]

var numbers = new int[] { 1, 2, 3, 4, 5 };
numbers.Square(); // must return [1, 4, 9, 16, 25]
numbers.Cube(); // must return [1, 8, 27, 64, 125]
numbers.Average(); // must return 3
numbers.Sum(); // must return 15
numbers.Even(); // must return [2, 4]
numbers.Odd(); // must return [1, 3, 5]