Solution 2: Zero Left

Given an integer array, move all elements equal to 0 to the left side while maintaining the order of other elements in the array. Return an array.

def zero_left(array)
  new_array = []
  for num in array
    if num == 0
      new_array.unshift(num)
    else
      new_array.push(num)
    end
  end
  new_array
end