数组类型错误：无法转换为长整数字符串 [英] Array TypeError: can't convert Fixnum into String

问题描述

我与阵列实验，和我由史蒂夫Holzner读的书开始Ruby on Rails的。我制作的节目：

I am experimenting with arrays, and am reading the book "Beginning Ruby on Rails" by Steve Holzner. I made the program:

array = ['Hello', 'there', 1, 2]
puts array[1]
puts array[3]
puts array.length
array2 = Array.new
puts array2.length
array2[0] = "Banana"
array2[1] = 6
puts array2[0] + " " + array2[1]
puts array3.length

它没有做太多，但是当我运行它，我得到的错误

It doesn't do much, but when i run it i get the error

arrays.rb:9:in `+': can't convert Fixnum into String (TypeError)
    from arrays.rb:9

为什么我得到这个错误？

Why do I get this error?

推荐答案

您不能添加一个字符串和一个整数（ Fixnum对象），在这种情况下，你试图加6到香蕉。

You can't add a string and a integer (Fixnum), in this case you tried to add 6 to "Banana".

如果在第9行，你这样做：

If on line 9 you did this:

puts array2[0] + " " + array2[1].to_s

您将获得：

"Banana 6"

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