Ruby中的哈希语法 [英] Hash syntax in Ruby

问题描述

根据 The Well Grounded Rubyist ：

Ruby允许在散列键位置使用特殊形式的符号表示形式，冒号之后的符号，而不是之前和散列分隔符箭头删除。换句话说，这是：

  hash = {：name => David，：age => 49} 
  

也可以这样写：

  hash = {姓名：David，年龄：49} 
  

我已经在ruby 1.8.7和1.9.2中试过了上面的代码 - 它不工作。我在做什么错了？

解决方案

Ruby 1.9中的新哈希语法仍然要求引用字符串， c $ c> David 您需要David。

试试这个：

  hash = {name：David，age：49} 
  

如果本书使用不带引号的单词 David ，这是错误的。您可能有兴趣阅读一些其他勘误。

According to The Well Grounded Rubyist:

Ruby allows a special form of symbol representation in the hash-key position, with the colon after the symbol instead of before it and the hash separator arrow removed. In other words, this:

hash = { :name => "David", :age => 49 }

can also be written like this:

hash = { name: David, age: 49 }

I have tried the preceding code in ruby 1.8.7 and 1.9.2 - It is not working. What am I doing wrong?

解决方案

The new hash syntax in Ruby 1.9 still requires that strings be quoted, so instead of David you need "David".

Try this:

hash = { name: "David", age: 49 }

If the book used the bare word David without quotation marks, it is wrong. You might be interested in reading some of the other errata.

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