Dear group,

Part of jOOQ's success is its incredible amount of convenience methods that
help reduce the boiler plate code at your side. We do this with massive
overloading of API, for instance, when you work with fetch(), you may have
noticed how many different types of fetch() there are in jOOQ.

Just now, I have added yet another convenience method. A Converter
constructor:
https://github.com/jOOQ/jOOQ/issues/5398

It looks like this:

    static <T, U> Converter<T, U> of(
        Class<T> fromType,
        Class<U> toType,
        Function<? super T, ? extends U> from,
        Function<? super U, ? extends T> to
    ) { ... }

And also:

    static <T, U> Converter<T, U> ofNullable(
        Class<T> fromType,
        Class<U> toType,
        Function<? super T, ? extends U> from,
        Function<? super U, ? extends T> to
    ) {
        return of(
            fromType,
            toType,
            t -> t == null ? null : from.apply(t),
            u -> u == null ? null : to.apply(u)
        );
    }


The above allows for creating simple ad-hoc, one-liner converters, such as:

    Converter<String, Integer> converter =
    Converter.ofNullable(String.class, Integer.class, Integer::parseInt,
Object::toString);

What's your biggest "itch" in the jOOQ API, which jOOQ could "scratch", or
rather, make go away by adding new convenience API?

All ideas welcome!
Lukas

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