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.

What is the primary focus of array update operators?

• They can be applied to any data type.

• They are used for string manipulation.

• They are specific to arrays.

• They are used for number calculations.

What does the 'add to set' operator do when an element is already present in the array?

• It ignores the element.

• It removes the element.

• It replaces the element.

• It adds the element again.

How does the 'add to set' operator treat an array?

• As a set with unique elements.

• As a list with duplicates.

• As a stack.

• As a queue.

What happens if you try to add the same element multiple times using 'add to set'?

• The element is added only once.

• The element is added multiple times.

• The element is removed.

• The array is cleared.

Which behavior does the 'add to set' operator replicate?

• List behavior.

• Set behavior.

• Stack behavior.

• Queue behavior.