HH\ImmVector::lazy

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

• Examples

Returns

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

Examples

See [Vector::lazy](</hack/reference/class/Vector/lazy/#examples>) for usage examples.