Package Exports
- lru-memoizer
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Readme
Memoize functions results using an lru-cache.
Installation
npm i lru-memoizer --saveIntro
This module uses an lru-cache internally to cache the results of an async function.
The load function can have N parameters and the last one must be a callback. The callback should be an errback (first parameter is err).
The hash function purpose is generate a custom hash for storing results. It has all the arguments applied to it minus the callback, and must return an string synchronous.
Usage
var memoizer = require('lru-memoizer');
var memoizedGet = memoizer({
//defines how to load the resource when
//it is not in the cache.
load: function (options, callback) {
request.get(options, callback);
},
//defines how to create a cache key from the params.
hash: function (options) {
return options.url + qs.stringify(options.qs);
},
//all other params for the LRU cache.
max: 100,
maxAge: 1000 * 60
});
memoizedGet({
url: 'https://google.com',
qs: { foo: 123 }
}, function (err, result, body) {
//console.log(body);
})
Sync lru-memoizer
Use memoizer.sync to cache things that are slow to calculate or methods returning promises.
var memoizer = require('lru-memoizer');
var memoizedGet = memoizer.sync({
//defines how to load the resource when
//it is not in the cache.
load: function (params) {
//return something_hard_to_compute;s
},
//defines how to create a cache key from the params.
hash: function (params) {
return params.foo;
},
//all other params for the LRU cache.
max: 100,
maxAge: 1000 * 60
});Similar modules
This module is very similar to async-cache, the main difference is the hash function.
License
MIT 2016 - José F. Romaniello