Simple Binary - Text converter (Ruby practise)(Can be done more easily using Ruby's `pack` and `unpack`)

binary-text-converter.rb

class BinaryText

    @eight_bit_nums = [128, 64, 32, 16, 8, 4, 2, 1]

    def self.binaryToText(binary)
        groups = binary.scan(/.{8}/)
        resultStr = ''

        # loop through groups of 8
        groups.each do |group|
            result = 0

            # loop through nums in group
            group.each_char.with_index do |bool, idx|
                if bool.to_i == 1
                    result += @eight_bit_nums[idx]
                end
            end

            resultStr += result.chr
        end

        return resultStr
    end

    def self.textToBinary(text)
        resultBin = ''

        text.each_byte do |char_code|
            group = ''

            remains = char_code
            @eight_bit_nums.each do |num|
                if remains / num > 0
                    # remains fits in curr number
                    remains -= num
                    group += '1'
                else
                    # remains doesn't fit in curr number
                    group += '0'
                end
            end

            resultBin += group
        end

        return resultBin
    end

end