micro-memoize

v5.1.1

Published

5 days ago

A blazing fast memoization library that is tiny but feature-rich.

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memoize memoized memoizer memoization memo cache cached storage memory optimize performance lru expire

micro-memoize

A blazing fast memoization library that is tiny but feature-rich.

micro-memoize

Importing

ESM:

import { memoize } from 'micro-memoize';

CommonJS:

const { memoize } = require('micro-memoize');

Usage

const toObject = (one: string, two: string) => ({ one, two });

const memoized = memoize(toObject);

console.log(memoized('one', 'two'));
console.log(memoized('one', 'two')); // pulled from cache

// Starting in `4.0.0`, you can compose memoized functions if you want to have multiple types of memoized
// versions based on different options.

const withUpToFive = memoize(memoized, { maxSize: 5 }); // { maxSize: 5 }
const withAsync = memoize(withUpToFive, { async: true }); // { async: true, maxSize: 5 }
const withCustomEquals = memoize(withAsync, { isEqual: deepEqual }); // { async: true, maxSize: 5, isEqual: deepEqual }

NOTE: The original function is the function used in the composition, the composition only applies to the options. In the example above, upToFive does not call simple, it calls fn.

Options

async

Identifies the value returned from the method as a Promise, which will result in one of two possible scenarios:

If the promise is resolved, it will fire the hit and update cache events.
If the promise is rejected, it will trigger auto-removal from cache as fire the delete cache event.

const fn = async (one: string, two: string) => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject(new Error(JSON.stringify({ one, two })));
    }, 500);
  });
};

const memoized = memoize(fn, { isPromise: true });

memoized('one', 'two');

console.log(memoized.cache.snapshot.keys); // [['one', 'two']]
console.log(memoized.cache.snapshot.values); // [Promise]

setTimeout(() => {
  console.log(memoized.cache.snapshot.keys); // []
  console.log(memoized.cache.snapshot.values); // []
}, 1000);

NOTE: If you don't want rejections to auto-remove the entry from cache, set async to false (or simply do not set it), but be aware this will also remove the cache listeners that fire on successful resolution.

expires

The amount of time in milliseconds that you want a computed value to be stored in cache for this method.

const fn = (item: Record<string, any>) => item;

const MAX_AGE = 1000 * 60 * 5; // five minutes;

const expiringMemoized = memoize(fn, { expires: MAX_AGE });

This can also be dynamic based on the entry, if a method is passed:

const fn = (item: Record<string, any>) => item;

const expiringMemoized = memoize(fn, {
  expires: (key, value) => shouldExpire(key, value),
});

You can also pass a custom configuration to handle conditional expiration.

const conditionalExpiringMemoized = memoize(fn, {
  expires: {
    after: MAX_AGE,
    shouldPersist: (item) => !item.expires,
    shouldRemove: (item) => item.updatedAt < new Date('2025-01-01').valueOf(),
    update: true,
  },
});

TIP: A common usage of this is in tandem with async for AJAX calls, and in that scenario the expected behavior is usually to have the expires countdown begin upon resolution of the promise. If this is your intended use case, you should also apply the update configuration option.

forceUpdate

Updates the cache forcibly for a given key when the predicate returns true. This is mainly useful if the function being memoized has time-based side-effects.

const fn = (item: string) => item;

let lastUpdate = Date.now();

const memoized = memoize(fn, {
  forceUpdate([item]: [string]) {
    const now = Date.now();
    const last = lastUpdated;

    lastUpdate = now;

    // its been more than 5 minutes since last update
    return last + 300000 < now;
  },
});

memoized('one');
memoized('one'); // pulled from cache

await Promise.resolve(() => setTimeout(resolve, MAX_AGE));

memoized('one'); // re-calls method and updates cache

isKeyEqual

Custom method to compare equality of keys, determining whether to pull from cache or not, by comparing the entire key.

type Arg = {
  one: string;
  two: null | string;
};

const fn = ({ one, two }: Arg) => [one, two];

const isFooEqualAndHasBar = (cacheKey: [Arg], key: [Arg]) =>
  cacheKey[0].one === key[0].one && cacheKey[1].hasOwnProperty('two') && key[1].hasOwnProperty('two');

const memoized = memoize(fn, { isKeyEqual: isFooEqualAndHasBar });

memoized({ one: 'two' }, { two: null });
memoized({ one: 'two' }, { two: 'three' }); // pulls from cache

isKeyItemEqual

defaults to Object.is

Custom method to compare equality of keys, determining whether to pull from cache or not, by comparing each argument in order. There are simple string options available for deep / shallow equality comparisons, or you can pass your own function for custom comparison.

type Arg = {
    one: {
        nested: string;
    };
    two: string;
};

const fn = ({ one, two }: Arg) => [one, two];

const deepMemoized = memoize(fn, { isKeyItemEqual: 'deep' });

deepMemoized({ one: { nested: 'one' }, two: 'two' });
deepMemoized({ one: { nested: 'one' }, two: 'two' }); // pulls from cache

const shallowMemoized = memoize(fn, { isKeyItemEqual: 'shallow' });

shallowMemoized({ one: 'one', two: 'two' });
shallowMemoized({ one: 'one', two: 'two' }); // pulls from cache

const customMemoized = memoize(fn, {
    isKeyItemEqual: (cacheKeyArg: Arg, keyArg: Arg) =>
        Object.keys(cacheKeyArg).length === 1 && Object.keys(keyArg).length === 1
    }
);

customMemoized({ one: 'two' };
customMemoized({ two: 'three' }); // pulls from cache

`deep`

Performs a deep equality comparison of each key item using the deepEqual method from fast-equals.

`shallow`

Performs a shallow equality comparison using the shallowEqual method from fast-equals.

maxArgs

The maximum number of arguments (starting from the first) used in creating the key for the cache.

const fn = (item1: string, item2: string, item3: string) => item1 + item2 + item3;

const memoized = memoize(fn, { maxArgs: 2 });

memoize('one', 'two', 'three');
memoize('one', 'two', 'four'); // pulls from cache, as the first two args are the same

If maxArgs is combined with either serialize or transformKey, the following order is used:

transform by transformKey (if applicable)
limit by maxArgs
serialize by serializer (if applicable)

maxSize

defaults to 1

The number of values to store in cache, based on a Least Recently Used basis. This operates the same as maxSize on memoize.

const manyPossibleArgs = (one: string, two: string) => [one, two];

const memoized = memoize(manyPossibleArgs, { maxSize: 3 });

memoized.cache.on('delete', (event) => console.log('Deleted from cache: ', event.key));

console.log(memoized('one', 'two')); // ['one', 'two']
console.log(memoized('two', 'three')); // ['two', 'three']
console.log(memoized('three', 'four')); // ['three', 'four']

console.log(memoized('one', 'two')); // pulled from cache
console.log(memoized('two', 'three')); // pulled from cache
console.log(memoized('three', 'four')); // pulled from cache

console.log(memoized('four', 'five')); // ['four', 'five'], Deleted from cache: ['one', 'two']

serialize

Serializes the parameters passed into a string and uses this as the key for cache comparison. If a method is passed instead of a boolean, it is used as a custom serializer.

const fn = (mutableObject: { one: Record<string, any> }) => mutableObject.property;

const serializedMemoized = memoize(fn, { serialize: true });
const customSerializedMemoized = memoize(fn, {
  serialize: (args) => [JSON.stringify(args[0])],
});

If serialize is combined with either maxArgs or transformKey, the following order is used:

transform by transformKey (if applicable)
limit by maxArgs (if applicable)
serialize

NOTE: This is much slower than the default key storage, and usually the same requirements can be meet with isKeyItemEqual: 'deep', so use at your discretion.

statsName

Name to use as unique identifier for the function when collecting statistics. Applying a statsName will also activate stats collection for that method.

startCollectingStats();

const fn = (item: string) => ({ item });

const memoized = memoize(fn, { statsName: 'my fancy identity' });

memoized('foo');
memoized('foo');
memoized('foo');

console.log(getStats('my fancy identity')); // { calls: 3, hits: 2, name: "my fancy identity", usage: "66.666666%" }

transformKey

Method that allows you transform the key that is used for caching, if you want to use something other than the arguments passed.

const ignoreFunctionArgs = (one: string, two: () => {}) => [one, two];

const memoized = memoize(ignoreFunctionArgs, {
  transformKey: (args) => [JSON.stringify(args[0])],
});

console.log(memoized('one', () => {})); // ['one', () => {}]
console.log(memoized('one', () => {})); // pulled from cache, ['one', () => {}]

If your transformed keys require something other than SameValueZero equality, you can combine transformKey with isKeyEqual for completely custom key creation and comparison.

const ignoreFunctionArg = (one: string, two: () => void) => [one, two];

const memoized = memoize(ignoreFunctionArg, {
  isMatchingKey: (key1, key2) => key1[0] === key2[0],
  // Cache based on the serialized first parameter
  transformKey: (args) => [JSON.stringify(args[0])],
});

console.log(memoized('one', () => {})); // ['one', () => {}]
console.log(memoized('one', () => {})); // pulled from cache, ['one', () => {}]

If transformKey is combined with either maxArgs or serialize, the following order is used:

transform by transformKey
limit by maxArgs (if applicable)
serialize (if applicable)

Additional properties

memoized.cache

The cache object that is used internally. This is a highly-optimized structure, but has several methods for manual cache manipulation.Direct cache manipulation

The cache is an optimized linked list internally, so working with the cache directly is advised against. However, there are several exposed ways to introspect or manually manipulate the cache based on common use-cases.

memoized.cache.clear()

This will clear all values in the cache, resetting it to an empty state.

const memoized = memoize((item: string) => item);

memoized.cache.clear();

memoized.cache.delete(args)

This will remove the key based on the provided args from cache. args should be an Array of values, meant to reflect the arguments passed to the method.

const memoized = memoize((item: { one: string }) => item);

const arg = { one: 'one' };

memoized(arg);

memoized.cache.delete([arg]);

// will re-execute, as it is no longer in cache
memoized(arg);

NOTE: This will only remove keys that exist in the cache, and will do nothing if the key does not exist.

memoized.cache.get(args)

Returns the value in cache if the key based on args matches, else returns undefined. args should be an Array of values, meant to reflect the arguments passed to the method.

const memoized = memoize((one: string, two: string) => [one, two);

memoized('one', 'two');

console.log(memoized.cache.get(['one', 'two'])); // ["one","two"]
console.log(memoized.cache.get(['two', 'three'])); // undefined

memoized.cache.has(args)

This will return true if a cache entry exists for the key based on the args passed, else will return false. args should be an Array of values, meant to reflect the arguments passed to the method.

const memoized = memoize((one: string, two: string) => [one, two]);

memoized('one', 'two');

console.log(memoized.cache.has(['one', 'two'])); // true
console.log(memoized.cache.has(['two', 'three'])); // false

memoized.cache.on(name, listener)

Event listeners are available for different cache events, so that you can monitor cache changes over time.

add

Fires when an item has been added to cache. Receives the event:

interface OnAddEvent<Fn> {
  cache: Cache<Fn>;
  key: Key;
  reason: string | undefined;
  type: 'add';
  value: ReturnType<Fn>;
}

Example:

const fn = (one: string, two: string) => [one, two];

const memoized = memoize(fn, { maxSize: 2 });

memoized.cache.on('add', (event) => {
  console.log(`cache has been added to: ${JSON.stringify(event.key)}`);
});

memoized('foo', 'bar'); // cache has been added to: ["foo","bar"]
memoized('foo', 'bar');
memoized('foo', 'bar');
memoized('bar', 'foo'); // cache has been added to: ["bar","foo"]
memoized('bar', 'foo');
memoized('bar', 'foo');
memoized('foo', 'bar');
memoized('foo', 'bar');
memoized('foo', 'bar');

delete

Fires when an item has been removed from cache. Receives the event:

interface OnDeleteEvent<Fn> {
  cache: Cache<Fn>;
  key: Key;
  reason: string | undefined;
  type: 'delete';
  value: ReturnType<Fn>;
}

Example:

const fn = (one: string, two: string) => [one, two];

const memoized = memoize(fn);

memoized.cache.on('delete', (event) => {
  console.log(`cache entry was deleted (${event.reason}): ${JSON.stringify(event.key)}`);
});

memoized('foo', 'bar');
memoized('foo', 'bar');
memoized('foo', 'bar');
memoized('bar', 'foo'); // cache entry was deleted (evicted): ["foo","bar"]
memoized('bar', 'foo');
memoized('bar', 'foo');
memoized('foo', 'bar'); // cache entry was deleted (evicted): ["bar","foo"]
memoized('foo', 'bar');
memoized('foo', 'bar');

hit

Fires when an item has been found in cache. Receives the event:

interface OnHitEvent<Fn> {
  cache: Cache<Fn>;
  key: Key;
  reason: string | undefined;
  type: 'hit';
  value: ReturnType<Fn>;
}

Example:

const fn = (one: string, two: string) => [one, two];

const memoized = memoize(fn, { maxSize: 2 });

memoized.cache.on('hit', (event) => {
  console.log(`cache entry found: ${JSON.stringify(event.key)}`);
});

memoized('foo', 'bar');
memoized('foo', 'bar'); // cache entry was found: ["foo","bar"]
memoized('foo', 'bar'); // cache entry was found: ["foo","bar"]
memoized('bar', 'foo');
memoized('bar', 'foo'); // cache entry was found: ["bar","foo"]
memoized('bar', 'foo'); // cache entry was found: ["bar","foo"]
memoized('foo', 'bar'); // cache entry was found: ["foo","bar"]
memoized('foo', 'bar'); // cache entry was found: ["foo","bar"]
memoized('foo', 'bar'); // cache entry was found: ["foo","bar"]

update

Fires when cache was reordered based on finding an older entry in cache and making it the most recent. Receives the event:

interface OnUpdateEvent<Fn> {
  cache: Cache<Fn>;
  key: Key;
  reason: string | undefined;
  type: 'update';
  value: ReturnType<Fn>;
}

Example:

const fn = (one: string, two: string) => [one, two];

const memoized = memoize(fn, { maxSize: 2 });

memoized.cache.on('update', (event) => {
  console.log(`cache has updated: ${JSON.stringify(event.key)}`);
});

memoized('foo', 'bar');
memoized('foo', 'bar');
memoized('bar', 'foo');
memoized('foo', 'bar'); // cache has updated: ["foo","bar"]
memoized('bar', 'foo'); // cache has updated: ["bar","foo"]
memoized('foo', 'bar'); // cache has updated: ["foo","bar"]
memoized('foo', 'bar');

memoized.cache.set(args, value)

This will manually add the value at the key based on args in cache if the key does not already exist; if the key exists, it will update the value. args should be an Array of values, meant to reflect the arguments passed to the method.

// single parameter is straightforward
const memoized = memoize((item: string) => item: string);

memoized.add(['one'], 'two');

// pulls from cache
memoized('one');

memoized.cache.snapshot

The cache is mutated internally for performance reasons, so logging out the cache at a specific step in the workflow may not give you the information you need. As such, to help with debugging you can request the cache.snapshot, which provides a well-formed snapshot of the cache:

type CacheSnapshot = {
  entries: Array<[Key, ReturnType<Fn>]>;
  keys: Key[];
  size: number;
  values: Array<ReturnType<Fn>>;
};

memoized.fn

The original function passed to be memoized.

memoized.isMemoized

Hard-coded to true when the function is memoized. This is useful for introspection, to identify if a method has been memoized or not.

memoized.options

The options passed when creating the memoized method.

Statistics

As-of version 5, you can collect statistics of memoize to determine if your cached methods are effective. To activate stats collection for a given memoized method, you must provide a statsName.

import { getStats, memoize, startCollectingStats } from 'memoize';

startCollectingStats();

const fn = (one: string, two: string) => [one, two];

const foo = memoize((one: string, two: string) => [one, two], {
  statsName: 'foo',
});
const bar = memoize((one: string, two: string) => `${one} ${two}`, {
  statsName: 'bar',
});
// this will have no stats collected
const baz = memoize((one: string, two: string) => ({ one, two }));

foo('one', 'two');
bar('one', 'two');
foo('one', 'two');
baz('one', 'two');

console.log(getStats('foo'));
/*
{
  "calls": 2,
  "hits": 1,
  "name": "foo",
  "usage": "50.000000%"
}
*/
console.log(getStats());
/*
{
  "calls": 3,
  "hits": 1,
  "profiles: {
    foo: {
      "calls": 2,
      "hits": 1,
      "name": "foo",
      "usage": "50.000000%"
    },
    "bar": {
      "calls": 1,
      "hits": 0,
      "name: "bar",
      "usage": "0.000000%"
    }
  },
  "usage": "33.333333%"
}
*/

NOTE: It is recommended not to activate this in production, as it has a small (but unnecessary) performance impact.

clearStats()

Cear statistics on memoized functions.

clearStats(); // clears all stats
clearStats('stats-name'); // clears stats only for 'stats-name'

getStats(statsName)

Get the statistics for a specific function, or globally.

startCollectingStats();

const fn = (one: string, two: string) => [one, two];

const memoized = memoize(fn);

const otherFn = (one: string[]) => one.slice(0, 1);

const otherMemoized = memoize(otherFn, { statsName: 'otherMemoized' });

memoized('one', 'two');
memoized('one', 'two');
otherMemoized(['three']);

getStats('otherMemoized');
/*
{
  "calls": 1,
  "hits": 0,
  "name": "otherMemoized",
  "usage": "0.000000%"
}
*/
getStats();
/*
{
  "calls": 3,
  "hits": 1,
  "profiles": {
    "otherMemoized": {
      "calls": 1,
      "hits": 0,
      "name": "otherMemoized",
      "usage": "0.000000%"
    }
  },
  "usage": "33.3333%"
}
*/

isCollectingStats()

Are statistics being collected on memoization usage.

startCollectingStats();
isCollectingStats(); // true
stopCollectingStats();
isCollectingStats(); // false

startCollectingStats()

Start collecting statistics on memoized functions with defined statsName options.

startCollectingStats();
s;

stopCollectingStats()

Stop collecting statistics on memoized functions with defined statsName options.

stopCollectingStats();

Benchmarks

All values provided are the number of operations per second (ops/sec) calculated by the Benchmark suite. Note that underscore, lodash, and ramda do not support mulitple-parameter memoization (which is where micro-memoize really shines), so they are not included in those benchmarks.

Benchmarks was performed on an i9 16-core Linux laptop with 64GB of memory using NodeJS version 24.11.0. The default configuration of each library was tested with a fibonacci calculation based on the following parameters:

Single primitive = 35
Single array = [35]
Single object = { number: 35 }
Multiple primitives = 35, true
Multiple arrays = [35], [true]
Multiple objects = { number: 35 }, { isComplete: true }

NOTE: Not all libraries tested support multiple parameters out of the box, but support the ability to pass a custom resolver. Because these often need to resolve to a string value, a common suggestion is to just JSON.stringify the arguments, so that is what is used when needed.

Single primitive parameter

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 19223652.896122 │
├───────────────┼─────────────────┤
│ lru-memoize   │ 18832637.003931 │
├───────────────┼─────────────────┤
│ fast-memoize  │ 18656534.751361 │
├───────────────┼─────────────────┤
│ mem           │ 18002171.563837 │
├───────────────┼─────────────────┤
│ lodash        │ 16593919.372016 │
├───────────────┼─────────────────┤
│ ramda         │ 15005783.713612 │
├───────────────┼─────────────────┤
│ addy osmani   │ 14595725.136778 │
├───────────────┼─────────────────┤
│ underscore    │ 14394123.608684 │
├───────────────┼─────────────────┤
│ memoizee      │ 14143422.526051 │
├───────────────┼─────────────────┤
│ memoizerific  │ 9098305.800331  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Single array parameter

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 17778297.542508 │
├───────────────┼─────────────────┤
│ lodash        │ 16538329.518316 │
├───────────────┼─────────────────┤
│ lru-memoize   │ 15486317.927651 │
├───────────────┼─────────────────┤
│ memoizee      │ 12094740.371154 │
├───────────────┼─────────────────┤
│ memoizerific  │ 8539559.392909  │
├───────────────┼─────────────────┤
│ mem           │ 5084143.134978  │
├───────────────┼─────────────────┤
│ ramda         │ 4779283.1256    │
├───────────────┼─────────────────┤
│ underscore    │ 4536871.295139  │
├───────────────┼─────────────────┤
│ addy osmani   │ 3930939.284558  │
├───────────────┼─────────────────┤
│ fast-memoize  │ 2280509.909947  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Single object parameter

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 17660028.460248 │
├───────────────┼─────────────────┤
│ lodash        │ 16156245.220626 │
├───────────────┼─────────────────┤
│ lru-memoize   │ 15870878.729231 │
├───────────────┼─────────────────┤
│ memoizee      │ 12282231.140112 │
├───────────────┼─────────────────┤
│ memoizerific  │ 8673522.519546  │
├───────────────┼─────────────────┤
│ mem           │ 3990242.123108  │
├───────────────┼─────────────────┤
│ ramda         │ 3740951.604329  │
├───────────────┼─────────────────┤
│ underscore    │ 3610838.023906  │
├───────────────┼─────────────────┤
│ addy osmani   │ 3091088.143196  │
├───────────────┼─────────────────┤
│ fast-memoize  │ 2037255.509585  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Multiple primitive parameters

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 15890715.277889 │
├───────────────┼─────────────────┤
│ lru-memoize   │ 14795822.850331 │
├───────────────┼─────────────────┤
│ memoizee      │ 8878241.434757  │
├───────────────┼─────────────────┤
│ memoizerific  │ 6746446.702835  │
├───────────────┼─────────────────┤
│ addy osmani   │ 5088726.104365  │
├───────────────┼─────────────────┤
│ mem           │ 4919428.914271  │
├───────────────┼─────────────────┤
│ ramda         │ 3931584.638274  │
├───────────────┼─────────────────┤
│ underscore    │ 3787236.410261  │
├───────────────┼─────────────────┤
│ lodash        │ 3521399.9522    │
├───────────────┼─────────────────┤
│ fast-memoize  │ 1921167.148268  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Multiple array parameters

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 16477581.429235 │
├───────────────┼─────────────────┤
│ lru-memoize   │ 15973386.171668 │
├───────────────┼─────────────────┤
│ memoizee      │ 8916765.084082  │
├───────────────┼─────────────────┤
│ memoizerific  │ 7394462.762389  │
├───────────────┼─────────────────┤
│ mem           │ 4230286.398649  │
├───────────────┼─────────────────┤
│ ramda         │ 3424812.638986  │
├───────────────┼─────────────────┤
│ underscore    │ 3271019.504488  │
├───────────────┼─────────────────┤
│ lodash        │ 3058024.57579   │
├───────────────┼─────────────────┤
│ addy osmani   │ 2556872.10781   │
├───────────────┼─────────────────┤
│ fast-memoize  │ 1664942.513511  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Multiple object parameters

┌───────────────┬─────────────────┐
│ Name          │ Ops / sec       │
├───────────────┼─────────────────┤
│ micro-memoize │ 16816183.60597  │
├───────────────┼─────────────────┤
│ lru-memoize   │ 15847710.978627 │
├───────────────┼─────────────────┤
│ memoizee      │ 8963861.306564  │
├───────────────┼─────────────────┤
│ memoizerific  │ 7279084.235795  │
├───────────────┼─────────────────┤
│ mem           │ 2891756.11455   │
├───────────────┼─────────────────┤
│ ramda         │ 2562787.384413  │
├───────────────┼─────────────────┤
│ underscore    │ 2508806.688495  │
├───────────────┼─────────────────┤
│ lodash        │ 2413141.440839  │
├───────────────┼─────────────────┤
│ addy osmani   │ 1882996.512818  │
├───────────────┼─────────────────┤
│ fast-memoize  │ 1431840.065495  │
└───────────────┴─────────────────┘
Fastest was "micro-memoize".

Support

Chrome 47+
Firefox 43+
Edge 14s+
Opera 34+
Safari 10+
Node 6+

Development

Standard stuff, clone the repo and npm install dependencies. The npm scripts available:

benchmark => run benchmarks against well-known alternative packages
build => run rollup to build the dist files
build:cjs => run rollup to build the dist files specific to CJS requires
build:esm => run rollup to build the dist files specific to ESM imports
build:min => run rollup to build the dist files specific to pre-minified files
build:umd => run rollup to build the dist files specific to legacy environments, such as Node 10
clean: remove dist folder
clean:cjs: remove dist/cjs folder
clean:esm: remove dist/esm folder
clean:min: remove dist/min folder
clean:umd: remove dist/umd folder
dev => run webpack dev server to run example app (playground!)
dist => runs build and build-minified
lint => run ESLint against all files in the src folder
release => runs the release process, which publishes the latest version of the package
release:beta => runs the beta release process, which publishes the next beta version of the package
release:scripts => run the precursor tasks as part of the release process
test => run unit tests
test:coverage => run test but with coverage
test:watch => run test but with persistent watcher
typecheck => run tsc to verify types are valid

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

micro-memoize

Table of contents

Importing

Usage

Options

async

expires

forceUpdate

isKeyEqual

isKeyItemEqual

deep

shallow

maxArgs

maxSize

serialize

statsName

transformKey

Additional properties

memoized.cache

memoized.cache.clear()

memoized.cache.delete(args)

memoized.cache.get(args)

memoized.cache.has(args)

memoized.cache.on(name, listener)

add

delete

hit

update

memoized.cache.set(args, value)

memoized.cache.snapshot

memoized.fn

memoized.isMemoized

memoized.options

Statistics

clearStats()

getStats(statsName)

isCollectingStats()

startCollectingStats()

stopCollectingStats()

Benchmarks

Single primitive parameter

Single array parameter

Single object parameter

Multiple primitive parameters

Multiple array parameters

Multiple object parameters

Support

Development

`deep`

`shallow`