<ul><li>A set is a unique unordered collection, which provides efficient item existence checks compared to arrays.</li><li>Using sets can enhance computational efficiency and reduce memory overhead by storing only unique elements.</li><li>Sets in Ruby are implemented using hashes, offering constant time lookup regardless of set size.</li><li>Sets ensure guaranteed uniqueness, offer performance advantages, and support mathematical set operations.</li><li>To start using sets in Ruby, you need to add the 'set' library, as sets are part of the standard library.</li><li>Sets can be created from arrays, and duplicates are automatically removed upon set creation.</li><li>Operations in sets like union, intersection, difference, and symmetric difference are available for efficient data manipulation.</li><li>Sets support methods for adding, removing, and checking membership of elements.</li><li>Use sets when uniqueness and fast membership checks are crucial, while arrays are preferred for ordered data and when duplicates hold significance.</li><li>Additional resources provided for further learning on sets and Ruby programming.</li></ul>

Sets are the Data Type Your Code Needs

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