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sindresorhus
147 Stars 16 Forks MIT License 20 Commits 2 Opened issues

Description

Memoize promise-returning & async functions

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p-memoize Build Status

Memoize promise-returning & async functions

Useful for speeding up consecutive function calls by caching the result of calls with identical input.

By default, only the memoized function's first argument is considered and it only works with primitives. If you need to cache multiple arguments or cache

object
s by value, have a look at options below.

Install

$ npm install p-memoize

Usage

const pMemoize = require('p-memoize');
const got = require('got');

const memGot = pMemoize(got, {maxAge: 1000});

(async () => { memGot('https://sindresorhus.com');

// This call is cached
memGot('https://sindresorhus.com');

setTimeout(() => {
    // This call is not cached as the cache has expired
    memGot('https://sindresorhus.com');
}, 2000);

})();

API

pMemoize(fn, options?)

Returns a memoized version of the

fn
function.

fn

Type:

Function

Promise-returning or async function to be memoized.

options

Type:

object

See the

mem
options in addition to the below option.

cachePromiseRejection

Type:

boolean
\ Default:
false

Cache rejected promises.

pMemoize.clear(memoized)

Clear all cached data of a memoized function.

Will throw if passed a non-memoized function.

Related

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