flatMap<T> method Null safety

Iterable<T> flatMap<T>(
  1. Transform<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.

Example:

[1, 2, 3].flatMap((n) => [n, n]) // => [1, 1, 2, 2, 3, 3]

Implementation

Iterable<T> flatMap<T>(Transform<E, Iterable<T>> f) {
  final self = this;
  return self != null ? _FlatMappedIterable(self.map(f)) : Iterable.empty();
}