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| author | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:54:57 +0100 |
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| committer | Philipp Tanlak <philipp.tanlak@gmail.com> | 2025-11-24 20:57:48 +0100 |
| commit | b1e2c8fd5cb5dfa46bc440a12eafaf56cd844b1c (patch) | |
| tree | 49d360fd6cbc6a2754efe93524ac47ff0fbe0f7d /node_modules/@alloc/quick-lru/readme.md | |
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| -rw-r--r-- | node_modules/@alloc/quick-lru/readme.md | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/node_modules/@alloc/quick-lru/readme.md b/node_modules/@alloc/quick-lru/readme.md new file mode 100644 index 0000000..7187ba5 --- /dev/null +++ b/node_modules/@alloc/quick-lru/readme.md @@ -0,0 +1,139 @@ +# quick-lru [](https://travis-ci.org/sindresorhus/quick-lru) [](https://coveralls.io/github/sindresorhus/quick-lru?branch=master) + +> Simple [“Least Recently Used” (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29) + +Useful when you need to cache something and limit memory usage. + +Inspired by the [`hashlru` algorithm](https://github.com/dominictarr/hashlru#algorithm), but instead uses [`Map`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Map) to support keys of any type, not just strings, and values can be `undefined`. + +## Install + +``` +$ npm install quick-lru +``` + +## Usage + +```js +const QuickLRU = require('quick-lru'); + +const lru = new QuickLRU({maxSize: 1000}); + +lru.set('🦄', '🌈'); + +lru.has('🦄'); +//=> true + +lru.get('🦄'); +//=> '🌈' +``` + +## API + +### new QuickLRU(options?) + +Returns a new instance. + +### options + +Type: `object` + +#### maxSize + +*Required*\ +Type: `number` + +The maximum number of items before evicting the least recently used items. + +#### maxAge + +Type: `number`\ +Default: `Infinity` + +The maximum number of milliseconds an item should remain in cache. +By default maxAge will be Infinity, which means that items will never expire. + +Lazy expiration happens upon the next `write` or `read` call. + +Individual expiration of an item can be specified by the `set(key, value, options)` method. + +#### onEviction + +*Optional*\ +Type: `(key, value) => void` + +Called right before an item is evicted from the cache. + +Useful for side effects or for items like object URLs that need explicit cleanup (`revokeObjectURL`). + +### Instance + +The instance is [`iterable`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Iteration_protocols) so you can use it directly in a [`for…of`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/for...of) loop. + +Both `key` and `value` can be of any type. + +#### .set(key, value, options?) + +Set an item. Returns the instance. + +Individual expiration of an item can be specified with the `maxAge` option. If not specified, the global `maxAge` value will be used in case it is specified on the constructor, otherwise the item will never expire. + +#### .get(key) + +Get an item. + +#### .has(key) + +Check if an item exists. + +#### .peek(key) + +Get an item without marking it as recently used. + +#### .delete(key) + +Delete an item. + +Returns `true` if the item is removed or `false` if the item doesn't exist. + +#### .clear() + +Delete all items. + +#### .resize(maxSize) + +Update the `maxSize`, discarding items as necessary. Insertion order is mostly preserved, though this is not a strong guarantee. + +Useful for on-the-fly tuning of cache sizes in live systems. + +#### .keys() + +Iterable for all the keys. + +#### .values() + +Iterable for all the values. + +#### .entriesAscending() + +Iterable for all entries, starting with the oldest (ascending in recency). + +#### .entriesDescending() + +Iterable for all entries, starting with the newest (descending in recency). + +#### .size + +The stored item count. + +--- + +<div align="center"> + <b> + <a href="https://tidelift.com/subscription/pkg/npm-quick-lru?utm_source=npm-quick-lru&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a> + </b> + <br> + <sub> + Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies. + </sub> +</div> |