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I'm trying to get a general solution to the problem of accessing an element in a nested hash given an array of key values,e.g.:
hash = { "a" => { "b" => 'foo' }}
array = ["a", "b"]
function(array)
=> "foo"
I'm guessing this could be a one-liner. It also is quite closely related to this problem: Ruby convert array to nested hash
249
Accessing a specific element in a nested hash is very similar to a nested array. It is as simple as calling hash[:x][:y] , where :x is the key of the hash and :y is the key of the nested hash.
Nested hashes allow us to further group, or associate, the data we are working with. They help us to deal with situations in which a category or piece of data is associated not just to one discrete value, but to a collection of values.
In Ruby, Hash is a collection of unique keys and their values. Hash is like an Array, except the indexing is done with the help of arbitrary keys of any object type. In Hash, the order of returning keys and their value by various iterators is arbitrary and will generally not be in the insertion order.
hash = { "a" => { "b" => 'foo' }}
array = ["a", "b"]
array.inject(hash,:fetch)
# => "foo"
array.inject(hash,:[])
# => "foo"
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