Lazy

:::info[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 KeyedIterable

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

Normally, memory is allocated for all of the elements of the KeyedIterable. 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<Tk,Tv> - a KeyedIterable representing the lazy view into the current KeyedIterable.