lazy
Note
This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.
Returns a lazy, access-elements-only-when-needed view of the current
ImmVector
public function lazy(): KeyedIterable<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().
Guide
Returns
KeyedIterable<int,Tv>- An integer-keyedKeyedIterablerepresenting the lazy view into the currentImmVector.
Examples
See Vector::lazy for usage examples.