flatMapIndexed<T> method Null safety

Iterable<T> flatMapIndexed<T>(
  1. IndexedTransform<E, 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 collection, providing sequential index of each element.

It's the index-aware version of flatMap().

Implementation

Iterable<T> flatMapIndexed<T>(IndexedTransform<E, Iterable<T>> f) =>
    this != null ? _FlatMappedIterable(mapIndexed(f)) : Iterable.empty();