Method flatMap

jOOQ/src/main/java/org/jooq/impl/Tools.java:2718–2727

Like Stream.of(array).map(mapper).toList() but without the entire stream pipeline.

(Iterable<? extends T> it, ThrowingFunction<? super T, ? extends List<? extends U>, E> mapper)

     * without the entire stream pipeline.
     */
    static final <T, U, E extends Exception> List<U> flatMap(Iterable<? extends T> it, ThrowingFunction<? super T, ? extends List<? extends U>, E> mapper) throws E {
        if (it == null)
            return emptyList();

        List<U> result = newListWithCapacity(it);
        for (T t : it)
            result.addAll(mapper.apply(t));

        return result;
    }

    /**
     * Like <code>Stream.of(array).zipWithIndex().map(mapper).toList()</code>