'+'无法将Fixnum转换为String(TypeError)

Question

我遇到了'无法将Fixnum转换为String(TypeError)'错误,虽然看起来很简单但我不确定如何解决它.我认为我的逻辑是合理的 - 将输入的字符串变量转换为整数然后执行基本操作 - 但显然我缺少一些关键信息.

puts 'What is your favourite number?'
favenum = gets.chomp
better = favenum.to_i + 1
puts 'Yeah '+favenum+' is nice enough but '+better+' is bigger and better by far! Think on.'    

已经尝试过寻找答案,但目前除了我的基本红宝石技能之外还有相同错误的例子.

Answer 1

Ruby(与其他语言不同)当它们是String#+方法中的操作数时,不会将对象强制转换为字符串.要么手动转换为字符串:

puts 'Yeah ' + favenum.to_s + ' is nice enough but ' + better.to_s + ' is bigger and better by far!'

或使用字符串插值(注意双引号):

puts "Yeah #{favenum} is nice enough but #{better} is bigger and better by far!"

Answer 2

尝试使用字符串插值,如下所示:

puts "Yeah #{favenum} is nice enough but #{better} is bigger and better by far! Think on."