HH\ImmSet::lazy

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

public function lazy(): KeyedIterable<arraykey, Tv>;

Normally, memory is allocated for all of the elements of an ImmSet. 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<arraykey,Tv> - an KeyedIterable representing the lazy view into the current ImmSet, where the keys are the same as the values.

Examples

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