Web Reference: To be usable as a Hash key, objects must implement the methods hash and eql?. Note: this requirement does not apply if the Hash uses compare_by_identity since comparison will then rely on the keys’ object id instead of hash and eql?. class Hash: A \Hash object maps each of its unique keys to a specific value. An array index is always an integer. A Ruby hash is one of the most versatile and frequently used data structures in the language. Hashes store data as key-value pairs, giving you fast lookups by key instead of by numeric index. Whether you are building a Rails application, writing a CLI tool, or processing API responses, understanding Ruby hash methods is essential for writing clean, idiomatic code.
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