Awesome
lru-memoize
lru-memoize
is a utility to provide simple memoization for any pure javascript function, using an LRU cache that prioritizes the most recently accessed values, and discards the "least recently used" (LRU) items when the size limit is reached. If your function has side effects or relies on some external state to generate its result, it should not be memoized.
Installation
npm install --save lru-memoize
Usage
Let's look at an example where we want to memoize a function that multiplies three numbers together, and we want to keep the last ten arguments -> value
mappings in memory.
ES5
var memoize = require('lru-memoize');
var multiply = function(a, b, c) {
return a * b * c;
}
multiply = memoize(10)(multiply);
module.exports = multiply;
ES6
import memoize from 'lru-memoize';
let multiply = (a, b, c) => a * b * c;
multiply = memoize(10)(multiply);
export default multiply;
API
memoize(limit:Integer?, equals:Function?, deepObjects:Boolean?)
Returns (Function) => Function
.
-limit
: Integer [optional]
The number of
arguments -> value
mappings to keep in memory. Defaults to1
.
-equals
: Function [optional]
A function to compare two values for equality. Defaults to
===
.
-deepObjects
: Boolean [optional]
Whether or not to perform a deep equals on Object values. Defaults to
false
.