# Filter Function This module provides a filter function that can be reused and composed in other applications. ## Beans for injection You can import the `FilterFunctionConfiguration` in a Spring Boot application and then inject the following bean. `filterFunction` You can use `filterFunction` as a qualifier when injecting. Once injected, you can use the `apply` method of the `Function` to invoke it and get the result. ## Configuration Options The filter function makes uses of link:../spel-function/README.adoc[SpEL function]. For more information on the various options available, please see link:../spel-function/src/main/java/org/springframework/cloud/fn/spel/SpelFunctionProperties.java[SpelFunctionProperties.java] ## Tests See this link:src/test/java/org/springframework/cloud/fn/filter/FilterFunctionApplicationTests.java[test suite] for examples of how this function is used. ## Other usage See this link:../../../applications/processor/filter-processor/README.adoc[README] where this function is used to create a Spring Cloud Stream application.