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memoize-one

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memoize-one

A memoization library which only remembers the latest invocation

  • 6.0.0
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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);

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Package last updated on 20 Oct 2021

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