FunctionExample.java

// For type clarity only, the following are smaller, reused operators:
Function<String, DataBlob> urlToBlob = …;
Function<DataBlob, List<ItemBlob>> blobToItemBlobs = …;
Predicate<ItemBlob> activeOnly = …;
Function<ItemBlob, UiModel> itemBlobToUiModel = …;
Function<List<UiModel>, List<UiModel>> sortByDateDesc = …;

Function<String, List<UiModel>> urlToUiModels =
    Functions.functionFrom(String.class)
        .apply(urlToBlob)
        .unpack(blobToItemBlobs)
        .filter(activeOnly)
        .map(itemBlobToUiModel)
        .morph(sortByDateDesc)
        .thenLimit(5);