哈希火箭是否被弃用？ [英] Is Hash Rocket deprecated?

问题描述

引用广泛 RIP Hash火箭文章似乎暗示了Hash Rocket语法（：foo =>bar）已被弃用，以支持新的 - 到 - Ruby JSON风格的散列（ foo：bar），但我找不到任何明确的引用，声明Hash Rocket实际上已被弃用/ Ruby 1.9。

The well-cited RIP Hash rocket post would seem to imply the Hash Rocket syntax (:foo => "bar") is deprecated in favor of the new-to-Ruby JSON-style hash (foo: "bar"), but I can't find any definitive reference stating the Hash Rocket form is actually deprecated/unadvised as of Ruby 1.9.

推荐答案

该博客文章的作者过于戏剧性和愚蠢， => ; 是仍然 完全 必要。特别是：

The author of that blog post is being overly dramatic and foolish, the => is still quite necessary. In particular:

1. 您必须使用火箭作为需要引用的符号：：'where.is'=> ; x 有效，但'where.is'：x 不是。 Ruby 2.2已经解决了这个问题，所以你可以在Ruby 2.2 +中说'where.is'：x 。


2. 必须使用对于无效标签符号的火箭：：$ set => x 是有效的，但 $ set：x 不是。在Ruby 2.2中，你可以用引号解决这个问题：'$ set'：x 会做正确的事情。


3. 你如果您在Hashes中使用不是符号的键，则必须使用火箭：'s'=> x 是有效的，但's'：x 是完全不同的。

1. You must use the rocket for symbols that require quoting: :'where.is' => x is valid but 'where.is': x is not. Ruby 2.2 has fixed this problem so you can say 'where.is': x in Ruby 2.2+.
2. You must use the rocket for symbols that are not valid labels: :$set => x is valid but $set: x is not. In Ruby 2.2+ you can get around this problem with quotes: '$set': x will do The Right Thing.
3. You must use the rocket if you use keys in your Hashes that aren't symbols: 's' => x is valid but 's': x is something completely different.

您可以用以下显而易见的方式来解决上述问题：

You can kludge around the above in the obvious manner of course:

h = { }
h[:'where.is'] = 'pancakes house?'
# etc.

<但这只是丑陋而不必要的。

but that's just ugly and unnecessary.

火箭不会破坏Ruby的哈希。

The rocket isn't going anywhere without crippling Ruby's Hashes.

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