Custom array each method

custom_array_each_method.rb

class Array
  def each(sym = nil)
    return enum_for(:each) if !block_given? && sym.nil?
    raise SyntaxError if block_given? && !sym.nil?
    i = 0
    while i < self.length
      sym.nil? ? yield(self[i]) : self[i].send(sym)
      i += 1
    end
    self
  end
end