Ruby Hash 到值数组
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Ruby Hash to array of values
提问by tbrooke
I have this:
我有这个：
hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
and I want to get to this: [["a","b","c"],["b","c"]]
我想解决这个问题： [["a","b","c"],["b","c"]]
This seems like it should work but it doesn't:
这似乎应该有效，但它没有：
hash.each{|key,value| value}
=> {"a"=>["a", "b", "c"], "b"=>["b", "c"]}
Any suggestions?
有什么建议？
回答by Ray Toal
Also, a bit simpler....
还有，简单一点......
>> hash = { "a"=>["a", "b", "c"], "b"=>["b", "c"] }
=> {"a"=>["a", "b", "c"], "b"=>["b", "c"]}
>> hash.values
=> [["a", "b", "c"], ["b", "c"]]
回答by Michael Durrant
I would use:
我会用：
hash.map { |key, value| value }
回答by jergason
hash.collect { |k, v| v }
#returns [["a", "b", "c"], ["b", "c"]]
Enumerable#collecttakes a block, and returns an array of the results of running the block once on every element of the enumerable. So this code just ignores the keys and returns an array of all the values.
Enumerable#collect接受一个块，并返回在可枚举的每个元素上运行该块一次的结果数组。所以这段代码只是忽略键并返回所有值的数组。
The Enumerablemodule is pretty awesome. Knowing it well can save you lots of time and lots of code.
该Enumerable模块非常棒。了解它可以为您节省大量时间和大量代码。
回答by mrded
hash = { :a => ["a", "b", "c"], :b => ["b", "c"] }
hash.values #=> [["a","b","c"],["b","c"]]
回答by Melissa Quintero
It is as simple as
就这么简单
hash.values
#=> [["a", "b", "c"], ["b", "c"]]
this will return a new array populated with the values from hash
这将返回一个用哈希值填充的新数组
if you want to store that new array do
如果你想存储那个新数组
array_of_values = hash.values
#=> [["a", "b", "c"], ["b", "c"]]
array_of_values
#=> [["a", "b", "c"], ["b", "c"]]
回答by karlingen
There is also this one:
还有这个：
hash = { foo: "bar", baz: "qux" }
hash.map(&:last) #=> ["bar", "qux"]
Why it works:
为什么有效：
The &calls to_procon the object, and passes it as a block to the method.
对对象的&调用to_proc，并将其作为块传递给方法。
something {|i| i.foo }
something(&:foo)
