ruby - ArgumentError : wrong number of arguments (given 0, 预期 1) Ruby

Question

ArgumentError: wrong number of arguments (given 0, expected 1).

代码打开文件查看段落并计数，报错 位于代码的中心。调用方法时发生错误(1)。 我不明白如何传递参数方法。

@books = "You can use this knowledge to create small tools that might help."

require "colorize"

class Filecalculation

    def select
        loop do
            puts "# Will we search : calculation_lines paragraph(1)".cyan
            print "\n>>>>>> ".yellow

            input = gets.chomp
            search_method = "calc_#{input}"
            if (respond_to?(search_method))

我无法理解如何将参数传递给这个地方。

                contents = send(search_method, @books)
            else
                puts "Unknown input: #{input.inspect}, method #{search_method} not defined."
            end 
       end 
    end  

    # =================== calc_1 сounting words in Text File 
    def calc_1 paragraph            
        word_count = paragraph.split.length 
        puts "#{word_count} words"   
    end
end

Filecalculation.new.select

Answer 1

如果您调用 send(search_method)，则您调用了一个不带参数的方法。要将参数传递给被调用的方法，您需要将它们作为下一个 send args 传递:

send(search_method, arg1, arg2)

你的情况

send(search_method, paragraph)

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