LeetCode： Sort Array By Parity

Question

Given an array A of non-negative integers, return an array consisting of all the even elements of A, followed by all the odd elements of A.

You may return any answer array that satisfies this condition.

Example 1:

Input: [3,1,2,4]

Output: [2,4,3,1]

Explanation: The outputs [4,2,3,1], [2,4,1,3], and [4,2,1,3] would also be accepted.

Solution

def sort_array_by_parity(a)
  even_result = []
  odd_result = []
  a.each do |element|
    even_result << element if element.even?
    odd_result << element if element.odd?
  end
  even_result + odd_result
end