Custom Array Flatten

custom_array.rb

# Partner: Chris Luhring, @cluhring

require_relative "custom_array"

RSpec.describe "CustomArray" do
  it "can flatten some custom array of numbers" do
    c = CustomArray.new([[1,2],[3,[4,5]]])
    expect(c.flatten).to eq([1, 2, 3, 4, 5])
  end

  it "can flatten some custom array of numbers" do
    c = CustomArray.new([["capybara", "hamster"],["mouse",["rat", "gerbil"]]])
    expect(c.flatten).to eq(["capybara", "hamster", "mouse", "rat", "gerbil"])
  end
end

# ==================================================================

class CustomArray
  attr_reader :array

  def initialize(array)
    @array = array
  end

  def flatten
    eval("[#{array.to_s.gsub("[", "").gsub("]", "")}]")
  end
end

Updated based on @worace's hacky feedback to make it work for arrays of numbers as well as strings.