module Hashery
Constants
- Stash
The
KeyHash
class is aHash
class which accepts a block for normalizing keys.The
KeyHash
class is essentially the same as a normalHash
. But notice the significant distinction of indifferent key access.s = KeyHash.new s[:x] = 1 s[:x] #=> 1 s['x'] #=> 1
We can see that internally the key has indeed been converted to a String.
s.to_h #=> {'x'=>1 }
By default all keys are converted to strings. This has two advantages over a regular
Hash
is many usecases. First it means hash entries have indifferent access.1
,"1"
and:1
are all equivalent –any object that defines#to_s
can be used as a key. Secondly, since strings are garbage collected so will defaultKeyHash
objects.But keys can be normalized by any function. Theses functions can be quite unique.
h = KeyHash.new(0){ |k| k.to_i } h[1.34] += 1 h[1.20] += 1 h[1.00] += 1 h #=> { 1 => 3 }
- VERSION