不一致的隐含哈希创建Ruby的？ [英] Inconsistent implicit hash creation in Ruby?

问题描述

好了，我在我自己的DSL来比较Ruby的一些东西。一个构建它们都支持本

Ok, so I was comparing some stuff in my own DSL to Ruby. One construct they both support is this

x=["key" => "value"]

了解数组和哈希的区别，我认为这是非法的，但结果在Ruby是

Knowing the difference between arrays and hashes, I would think this to be illegal, but the result in Ruby is

[{"key" => "value"}]

这是为什么？而与此有点语法你为什么不能做。

Why is this? And with this kinda syntax why can't you do

x=("key" => "value") 

为什么是一个数组的隐式创建的哈希一个特例？

Why is an array a special case for implicitly created hashes?

推荐答案

另一种特殊情况是在一个函数调用，考虑：

Another special case is in a function call, consider:

def f(x)
  puts "OK: #{x.inspect}"
end
f("foo" => "bar")
=> OK: {"foo"=>"bar"}

因此​​，在某些情况下，哈希值可以被隐建（通过检测 =＆GT; 运营商）。我想答案就是，这是马茨上最不令人惊讶的行为。

So in some contexts, Hashes can be built implicitly (by detecting the => operator?). I suppose the answer is just that this was Matz's least-surprising behavior.

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