Usage

import TimedCache from "@avolgha/timed-cache";

const sleep = (time: number) => new Promise((res) => setTimeout(res, time));

(async () => {
	const cache = new TimedCache(1000 * 3);

	cache.set("foo", "bar");

	console.log(cache.get("foo"));
	// => "bar"

	await sleep(1000 * 2);

	console.log(cache.get("foo"));
	// => "bar";

	await sleep(1000 * 2);

	console.log(cache.get("foo"));
	// => null
})();

Todos

done in v1.0.1

• [x] Create a way to access stored keys.
• [x] Give the developer access to the remaining time of an item.
• [x] Create a forEach function.
• [x] Let developer optionally choose a time for the items removal.

Configuration

You can crate a cache by instantiating the default export of the @avolgha/timed-cache package.
Optionally, you can specify the time after that an item of the map should be deleted. This time has to be specified in milliseconds.

const cache = new TimedCache();
// => items will be deleted after 5 minutes

const cache = new TimedCache(1000 * 3);
// => items will be deleted after 3 seconds

A cache can only contain one type of item. You can specify this type with a generic on the TimedCache class:

const stringCache = new TimedCache<string>();

If you don't specify any generic, TypeScript will refer to any as the default type.

Methods

To add items to the map, you can use the set method. It requires two arguments, a key and a value.

const key: string = "foo";
const value: string = "bar";

cache.set(key, value);

// you can also specify a custom time for each item:
cache.set(key, value, 1000);

If you then want to get a specific item from the cache, you can use the get method. This method only requires the key of the item you want to get.

const key = "foo";
const value = cache.get(key);

Like get you can also iterate over every item in the cache.

cache.forEach((value) => {
	// noop
});

If you want to get all the stored keys in the cache, you have to access them through the keys property.

const keys = cache.keys;

If you then not longer need the value, you can remove it with the remove function. This function aswell only needs the key of the item. And additionally, it returns the item you removed.

const key = "foo";
const removed = cache.remove(key);

To check if there is an item with a given key, you can check this with the help of the has function. It only requires the key of the item you want to check for existance.

const key = "foo";
if (cache.has(key)) {
	console.log(`"${cache.get(key)}" is in the cache!`);
}

If you want to see the remaining time of the entry in the cache, you can use the remaining function.

const key = "foo";

const timeRemaining = cache.remaining(key);