HH\ImmVector::lazy

Returns a lazy, access-elements-only-when-needed view of the current ImmVector

public function lazy(): LazyKeyedIterableView<int, Tv>;

Normally, memory is allocated for all of the elements of an ImmVector. With a lazy view, memory is allocated for an element only when needed or used in a calculation like in map() or filter().

Return Values

  • LazyKeyedIterableView<int, Tv> - An integer-keyed KeyedIterable representing the lazy view into the current ImmVector.