utf 8 - Ruby中的utf -8字符串

Question

我有以下模块:

# encoding: utf-8
module RandomNameModule
    def self.doesNothing(word)
        str = ""
        word.codepoints{|val|
            str << val.chr
        }
        return str
    end
end

和下面的测试:

# encoding: utf-8
require 'test/unit'
require '../src/RandomNameModule.rb'
class RandomNameTests < Test::Unit::TestCase
    def testDoesNothing
        sorted = WordSort.word_sort("£$&")
        assert_equal("£$&", sorted)
    end
end

当我运行测试时，我得到一个断言失败:

<"£$&"> expected but was
<"xA3$&">.

这是因为"£".codepoints{|x| x.chr}返回值xA3

我怎么能使这个返回£

Answer 1

在你的例子中使用的Integer#chr方法似乎默认为ASCII，如果你不显式地告诉它使用什么编码:

def self.doesNothing(word)
  str = ""
  word.codepoints { |val| str << val.chr("utf-8") }
  str
end

另外，使用String#each_char代替String#codepoints也可以:

def self.doesNothing(word)
  str = ""
  word.each_char { |val| str << val }
  str
end