cache

Re-reselect cache objects

re-reselect cache makes use of the strategy pattern to provide custom interchangable caching implementations.

Available cache objects

re-reselect ships with 6 ready-to-use cache object constructors:

name	accepted cacheKey	type	storage
FlatObjectCache	number string	flat unlimited	JS object
FifoObjectCache	number string	first in first out	JS object
LruObjectCache	number string	least recently used	JS object
FlatMapCache	any	flat unlimited	Map object
FifoMapCache	any	first in first out	Map object
LruMapCache	any	least recently used	Map object

import {createCachedSelector, LruObjectCache, LruMapCache} from 're-reselect';

createCachedSelector(
  // ...
)({
  keySelector,
  cacheObject: new LruObjectCache({cacheSize: 5}),
  // or:
  // cacheObject: new LruMapCache({cacheSize: 5}),
});

[*]ObjectCache strategy objects treat cacheKey of type number like strings, since they are used as arguments of JS objects.

[*]MapCache strategy objects need a Map objects polyfill in order to use them on non-supporting browsers.

Write your custom cache object

If none of the provided caching solutions fits your needs you can write your own cache object!

Declare a JS object adhering to the following interface and pass it to re-reselect as options.cacheObject:

interface ICacheObject {
  set(key: any, selectorFn: any): void;
  get(key: any): any;
  remove(key: any): void;
  clear(): void;
  isValidCacheKey?(key: any): boolean; // optional
}