Web Reference: class Hash: A \Hash object maps each of its unique keys to a specific value. An array index is always an integer. Ruby hashes are implemented as hash tables, giving you O (1) average-case lookup, insertion, and deletion. Here are practical tips to keep your hash operations fast. Two objects refer to the same hash key when their hash value is identical and the two objects are eql? to each other. A user-defined class may be used as a hash key if the hash and eql? methods are overridden to provide meaningful behavior. By default, separate instances refer to separate hash keys.
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