getOrElse

function Cache.getOrElse(
    cache: Cache<K, V>,
    key: K,
    orElse: (cache: Cache<K, V>) => T
): V | T

Gets a value from the cache by key, calling the fallback function if the key doesn't exist. Useful for lazy computation or setting a default value in the cache.

Example

import { Cache } from "@monstermann/cache";

const cache = Cache.Map<string, number>();

Cache.set(cache, "foo", 42);

Cache.getOrElse(cache, "foo", () => 0); // 42
Cache.getOrElse(cache, "bar", () => 0); // 0

// Set default value if missing
Cache.getOrElse(cache, "baz", (c) => {
    return Cache.set(c, "baz", 100);
}); // 100