Lambda Functions in ksqlDB for Confluent Platform

Use lambda functions, or “lambdas” for short, to express simple inline functions that can be applied to input values in various ways. For example, you could apply a lambda function to each element of a collection, resulting in a transformed output collection. Also, you can use lambdas to filter the elements of a collection, or reduce a collection to a single value. The advantage of a lambda is that you can express user-defined functionality in a way that doesn’t require implementing a full UDF.

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