flatMap<T> method Null safety

Iterable<T> flatMap<T>(
  1. EntryTransform<K, V, Iterable<T>> f
)

Return a new lazy Iterable of all elements yielded from results of transform f function being invoked on each element of original entries.

Implementation

Iterable<T> flatMap<T>(EntryTransform<K, V, Iterable<T>> f) =>
    this?.entries.flatMap((e) => f(e.key, e.value)) ?? Iterable.empty();