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@emotion/weak-memoize

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@emotion/weak-memoize

A memoization function that uses a WeakMap

    0.3.1latest
    GitHub
    npm

Version published
Maintainers
4
Weekly downloads
10,363,984
increased by2%

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Package description

What is @emotion/weak-memoize?

The @emotion/weak-memoize package is designed for memoization, a programming technique used to speed up computer programs by storing the results of expensive function calls and returning the cached result when the same inputs occur again. Specifically, it uses weak references to keys for memoizing, which allows for the garbage collection of keys that are no longer in use, preventing potential memory leaks in applications.

What are @emotion/weak-memoize's main functionalities?

Memoization of functions with object arguments

This feature allows you to memoize functions that take objects as arguments. When you pass an object to the memoized function, it computes the result and caches it. Subsequent calls with an object that has the same reference will return the cached result instead of recomputing it.

const memoizedFunc = weakMemoize(arg => { return expensiveComputation(arg); });
const result = memoizedFunc({ key: 'value' });
// Calling memoizedFunc with the same argument will return the cached result without recomputing

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Readme

Source

@emotion/weak-memoize

A memoization function that uses a WeakMap

Install

yarn add @emotion/weak-memoize

Usage

Because @emotion/weak-memoize uses a WeakMap the argument must be a non primitive type, e.g. objects, functions, arrays and etc. The function passed to weakMemoize must also only accept a single argument.

import weakMemoize from '@emotion/weak-memoize'

let doThing = weakMemoize(({ someProperty }) => {
  return { newName: someProperty }
})

let obj = { someProperty: true }

let firstResult = doThing(obj)

let secondResult = doThing(obj)

firstResult === secondResult // true

let newObj = { someProperty: true }

let thirdResult = doThing(newObj)

thirdResult === firstResult // false

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Last updated on 06 May 2023

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