Package Exports

trie-memoize

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Readme

trie-memoize

npm i trie-memoize

A memoization algorithm in which each function argument represents a new key in a mapping, creating a trie of caches - the depth of which defined by your setup. It is very quick with its O(n arguments) lookup performance and is memory-efficient, particularly when WeakMaps are used.

This memoization function only works for functions where the exact number of arguments is known and constant.

Quick Start

const m1 = memoize([{}], v => v.toUpperCase())
m1('foo') // FOO uncached
m1('foo') // FOO cached
const m2 = memoize([{}, Map], (v1, v2) => `${v1}-${v2}`)
m2('foo', 'bar') // foo-bar, uncached
m2('foo', 'bar') // foo-bar, cached

const m3 = memoize(
  [WeakMap, Map, WeakMap],
  (v1, v2, v3) =>
    `${JSON.stringify(v1)}-${JSON.stringify(v1)}-${JSON.stringify(v3)}`
)
let v1 = {},
  v2 = 'foo',
  v3 = {}
m3(v1, v2, v3) // {}-"foo"-{} uncached
m3(v1, v2, v3) // {}-"foo"-{} cached

API

`memoize(caches: (MapLike | Record<any, any>)[], fn: (...args: any[]) => any)`

Argument	Type	Description
caches	`MapLike[]`	An array of plain objects or map-like constructors (Map, WeakMap, some custom map w/ get + set methods) used for caching each level of the tree. The first array element will be the cache for the first argument of the function, call, and so on. Therefore, the length of this array must be the same as the length of arguments your memoized function accepts, or at least as deep as you'd like to cache.
fn	`Function`	The function you'd like to memoize

LICENSE

MIT