What is memoize-one?
The memoize-one package is a simple and lightweight memoization library designed for memoizing the result of a function based on the latest arguments. It only remembers the latest arguments and result, and it will only recompute the result when the arguments change. This can be particularly useful for optimizing performance in scenarios where expensive function calls are frequently made with the same arguments.
What are memoize-one's main functionalities?
Simple memoization of functions
This feature allows you to create a memoized version of a function that caches the result based on the latest set of arguments it was called with. If the function is called again with the same arguments, the cached result is returned instead of recomputing.
const memoizeOne = require('memoize-one');
const add = (a, b) => a + b;
const memoizedAdd = memoizeOne(add);
console.log(memoizedAdd(1, 2)); // 3
console.log(memoizedAdd(1, 2)); // 3, cached result
console.log(memoizedAdd(2, 2)); // 4, recomputed because arguments changed
Custom equality function
This feature allows you to provide a custom function to compare the equality of arguments. This is useful when you need to memoize a function that takes complex arguments like objects or arrays and the default shallow comparison is not sufficient.
const memoizeOne = require('memoize-one');
const isEqual = (newArgs, lastArgs) => JSON.stringify(newArgs) === JSON.stringify(lastArgs);
const complexFunction = (obj) => {/* complex operation */};
const memoizedComplexFunction = memoizeOne(complexFunction, isEqual);
Other packages similar to memoize-one
lodash.memoize
Lodash provides a memoize function that can cache the result of function calls based on the arguments passed. It allows for custom cache implementations and is part of the larger Lodash utility library, which provides a wide range of functions for manipulating and traversing data.
fast-memoize
Fast-memoize is a high-performance memoization library that claims to be the fastest possible memoization library in JavaScript. It supports multiple argument memoization and provides various options for cache creation, argument serialization, and strategy selection.
reselect
Reselect is a selector library for Redux that uses memoization to efficiently compute derived data from the Redux store. It is specifically designed for use with Redux and allows for creating memoized selector functions that can compute derived data, optimizing performance for Redux applications.