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transform() operator

Anjali Sharma answered on January 6, 2023 Popularity 1/10 Helpfulness 1/10

answer transform() operator

transform() operator

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A handy operator to transform stream data

 public Flux<String> namesFlux_transform(int stringLength) {

        Function<Flux<String>, Flux<String>> filterMap = name -> name.map(String::toUpperCase)
                .filter(s -> s.length() > stringLength);

        var namesList = List.of("alex", "ben", "chloe"); // a, l, e , x
        return Flux.fromIterable(namesList)
                .transform(filterMap) // gives u the opportunity to combine multiple operations using a single call.
                .flatMap(this::splitString)
                .defaultIfEmpty("default");
        //using "map" would give the return type as Flux<Flux<String>

    }


    public Flux<String> namesFlux_transform_switchIfEmpty(int stringLength) {

        Function<Flux<String>, Flux<String>> filterMap = name -> name.map(String::toUpperCase)
                .filter(s -> s.length() > stringLength)
                .flatMap(this::splitString);

        var defaultFlux = Flux.just("default")
                .transform(filterMap); //"D","E","F","A","U","L","T"

        var namesList = List.of("alex", "ben", "chloe"); // a, l, e , x
        return Flux.fromIterable(namesList)
                .transform(filterMap) // gives u the opportunity to combine multiple operations using a single call.
                .switchIfEmpty(defaultFlux);
        //using "map" would give the return type as Flux<Flux<String>

    }


    public Flux<String> namesFlux_transform_concatwith(int stringLength) {
        Function<Flux<String>, Flux<String>> filterMap = name -> name.map(String::toUpperCase)
                .filter(s -> s.length() > stringLength)
                .map(s -> s.length() + "-" + s);

        var namesList = List.of("alex", "ben", "chloe"); // a, l, e , x
        var flux1 = Flux.fromIterable(namesList)
                .transform(filterMap);

        var flux2 = flux1.concatWith(Flux.just("anna")
                .transform(filterMap));

        return flux2.log();

    }

https://github.com/dilipsundarraj1/reactive-spring-webflux/blob/springboot3.0/reactive-programming-using-reactor/src/main/java/com/learnreactiveprogramming/service/FluxAndMonoGeneratorService.java

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript

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Contributed on Jan 06 2023

Anjali Sharma

0 Answers Avg Quality 2/10

transform() operator

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