ruby 哈希火箭被弃用了吗？
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Is Hash Rocket deprecated?
提问by mahemoff
The well-cited RIP Hash rocket postwould 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.
被广泛引用的RIP HashRocket帖子似乎暗示 Hash Rocket 语法 ( :foo => "bar") 已被弃用，以支持新的 Ruby JSON 样式哈希 ( foo: "bar")，但我找不到任何明确的参考资料说明 Hash Rocket 形式从 Ruby 1.9 开始，实际上已弃用/不建议使用。
回答by mu is too short
The author of that blog post is being overly dramatic and foolish, the =>is stillquitenecessary. In particular:
该博客文章的作者是过于戏剧性的和愚蠢的 =>是还是相当必要的。特别是：
- You must use the rocket for symbols that require quoting:
:'where.is' => xis valid but'where.is': xis not. Ruby 2.2 has fixed this problem so you can say'where.is': xin Ruby 2.2+. - You must use the rocket for symbols that are not valid labels:
:$set => xis valid but$set: xis not. In Ruby 2.2+ you can get around this problem with quotes:'$set': xwill do The Right Thing. - You must use the rocket if you use keys in your Hashes that aren't symbols:
's' => xis valid but's': xis something completely different.
- 对于需要引用的符号，您必须使用火箭：
:'where.is' => x有效但'where.is': x无效。Ruby 2.2 已经修复了这个问题，所以你可以'where.is': x在 Ruby 2.2+ 中说。 - 对于不是有效标签的符号，您必须使用火箭：
:$set => x有效但$set: x不是。在 Ruby 2.2+ 中，您可以使用引号解决这个问题：'$set': xwill do The Right Thing。 - 如果您在哈希中使用不是符号的键，则必须使用火箭：
's' => x有效但's': x完全不同的东西。
You can kludge around the above in the obvious manner of course:
当然，您可以以明显的方式围绕上述内容进行混搭：
h = { }
h[:'where.is'] = 'pancakes house?'
# etc.
but that's just ugly and unnecessary.
但这只是丑陋和不必要的。
The rocket isn't going anywhere without crippling Ruby's Hashes.
如果不削弱 Ruby 的哈希值，火箭就不会去任何地方。
