Key Takeaways About $isArray Operator

• The $isArray operator in MongoDB is used in aggregation pipelines to determine if an operand is an array, returning a boolean value.
• When used with a string, $isArray returns false, but when used with an array within an array, it returns true.
• When applied to null or undefined values, $isArray returns false.
• The operator is useful for checking whether a field contains an array, allowing for conditional operations based on the presence of arrays in MongoDB documents.

MongoDB $isArray operator is a type of array expression operator used in the aggregation pipeline stages. This operator is used to check if the specified expression is an array or not.

This operator will return true if the specified expression is an array. Otherwise, it will return false.