MongoDB Mastering MongoDB for Beginners (Theory and Projects) - $addToSet operator

The video tutorial introduces array update operators, focusing on the 'add to set' operator. It explains how this operator treats arrays like sets, ensuring elements are unique. A practical example demonstrates adding elements to an array using 'add to set', highlighting its behavior of not adding duplicate elements. The tutorial emphasizes the importance of using this operator to maintain unique elements in arrays, similar to set behavior in MongoDB.

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