Ruby 我的弦怎么了？

以下代码正在生成错误，我看不到问题。有人能帮忙吗

customer_array = [‘Ken’,’William’,’Catherine’,’Mark’,’Steve’,’Sam’]
customer_hash = {
‘Ken’ => ‘Fiction’,
‘William’ => ‘Mystery’,
‘Catherine’ => ‘Computer’,
‘Mark’ => ‘Fiction’,
‘Steve’ => ‘Sports’,
‘Sam’ => ‘Fiction’
}
# => customer_array.rb:6: syntax error, unexpected tSTRING_BEG , expecting '}'
# 'William' => 'Mystery'
#      ^

---

问题似乎在于那些奇怪的反报价。请尝试以下方法：

customer_array = ["Ken","William","Catherine","Mark","Steve","Sam"]
customer_hash = {
    "Ken" => "Fiction",
    "William" => "Mystery",
    "Catherine" => "Computer",
    "Mark" => "Fiction",
    "Steve" => "Sports",
    "Sam" => "Fiction"
}

---

您有很多键=>值一个哈希包含一个键（在箭头之前）和一个值（在箭头之后）

您可以创建一个哈希数组。RubyonRails使用这个

你必须修正引号

customer_hash = {
    "Ken" => "Fiction",
    "William" => "Mystery",
    "Catherine" => "Computer",
    "Mark" => "Fiction",
    "Steve" => "Sports",
    "Sam" => "Fiction"
}

但是为什么不这样做呢

customer_array_of_hashes =  [
{'Ken' => 'Fiction'},
{'William' => 'Mystery'},
{'Catherine' => 'Computer'},
{'Mark' => 'Fiction'},
{'Steve'=> 'Sports'},
{'Sam' => 'Fiction'}
]

customer_array_of_hashes.each do|hash|
 hash.each do |key, value|
  puts "lastname: " + value + ", firstname: " + key
 end
end

然后你可以像这样绕着它转

customer_array_of_hashes =  [
{'Ken' => 'Fiction'},
{'William' => 'Mystery'},
{'Catherine' => 'Computer'},
{'Mark' => 'Fiction'},
{'Steve'=> 'Sports'},
{'Sam' => 'Fiction'}
]

customer_array_of_hashes.each do|hash|
 hash.each do |key, value|
  puts "lastname: " + value + ", firstname: " + key
 end
end

您可以在这里找到所有ruby类上的许多方法

这里还有额外的方法

最后一个提示

试试这个

irb(main):039:0> customer_array_of_hashes.class
=> Array

irb(main):040:0> customer_array_of_hashes.first.class
=> Hash

如果你想知道ruby中有什么类，class方法会给出答案

好的，您知道customer\u数组是一个数组。可以在数组上使用的一种方法是

试试这个

irb(main):039:0> customer_array_of_hashes.class
=> Array

irb(main):040:0> customer_array_of_hashes.first.class
=> Hash

好的，这是一个哈希数组

---

好看

您的引号是非ASCII字符

将它们替换为ASCII

”

或

“

或者将

#encoding:UTF-8

添加到文件的开头，并将它们用ASCII引号括起来，如下所示：

# encoding: UTF-8

customer_hash = {
  "‘Ken’" => "‘Fiction’",
}

---

你试过双引号吗？你也可以使用单引号，正如@slivu在他的回答中所说。单引号或双引号有效，但反向引号无效。