Lazy

Lazy represents a lazy evaluated value. Lazy is memoizing, i.e. it evaluates only once and therefore is referential transparent.

/** @var $lazy Lazy<int> */

$lazy = Lazy::of(function (): int {return random_int(1, 1000); });

$lazy->isEvaluated(); // return false

$lazy->get(); //returns random int

$lazy->isEvaluated(); // return true

$lazy->get(); // returns same random int