Lambda Functions in ksqlDB for Confluent Platform

A lambda function, or “lambda” for short, is a simple inline function you can apply to input values. For example, you can use a lambda function to transform each element of a collection, filter the elements of a collection, or reduce a collection to a single value. The advantage of a lambda is that it expresses a user-defined feature without requiring you to implement a full UDF.

Learn how to use lambda functions in the how-to guide.