哈希火箭被弃用了吗? [英] Is Hash Rocket deprecated?

问题描述

被广泛引用的RIP Hash Rocket 帖子 似乎暗示 Hash Rocket 语法(:foo => "bar")已被弃用，以支持新的 Ruby JSON-style hash (foo: "bar")，但我找不到任何明确的参考，说明自 Ruby 1.9 起，Hash Rocket 形式实际上已被弃用/不建议使用.

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

那篇博文的作者过于戏剧化和愚蠢，=> 是 仍然 相当 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. 对于不是有效标签的符号，您必须使用火箭::$set =>x 有效但 $set: x 无效.在 Ruby 2.2+ 中，您可以使用引号解决这个问题:'$set': x will do The Right Thing.

1. 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.

如果您在哈希中使用不是符号的键，例如字符串、整数或常量，则必须使用火箭.例如，'s' =>x 是有效的，但 's': x 是完全不同的东西.

You must use the rocket if you use keys in your Hashes that aren't symbols, such as strings, integers or constants. For example, 's' => x is valid but 's': x is something completely different.

当然，你可以用明显的方式在上面胡说八道:

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

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

但这只是丑陋和不必要的.

but that's just ugly and unnecessary.

如果不破坏 Ruby 的哈希值，火箭就不会去任何地方.

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

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