https://github.com/danielnaab/weakmap-memoize

Lightweight WeakMap-based function memoization.
https://github.com/danielnaab/weakmap-memoize

Last synced: 3 months ago
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Lightweight WeakMap-based function memoization.

• Host: GitHub
• URL: https://github.com/danielnaab/weakmap-memoize
• Owner: danielnaab
• Created: 2015-12-21T22:54:27.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2015-12-22T00:32:53.000Z (over 10 years ago)
• Last Synced: 2025-12-29T04:18:31.590Z (7 months ago)
• Language: JavaScript
• Size: 1.95 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# weakmap-memoize

This is a very lightweight [`WeakMap`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap)-based memoization wrapper that allows you to

use your own preferred `WeakMap` implementation, of which there are

[many](https://www.npmjs.com/search?q=weakmap).

NOTE: You are constrained in that only the first argument to your function will

used to do the memoization, and it must be an object.

Usage:

    var memoize = require('weakmap-memoize')

    var WeakMapShim = require('weakmap-shim')

    var times = 0

    var myFunction = memoize(WeakMapShim(), function (obj) {

        times++

        return obj.num + 1

    })

    var one = {num: 1}

    var two = {num: 2}

    assert.equal(myFunction(one), 2)

    assert.equal(times, 1)

    assert.equal(myFunction(one), 2)

    assert.equal(times, 1)

    assert.equal(myFunction(two), 3)

    assert.equal(times, 2)

    assert.equal(myFunction(two), 3)

    assert.equal(times, 2)

    myFunction = memoize(WeakMapShim(), function (obj1, obj2) {

        return obj1.num + obj2.num

    })

    assert.equal(myFunction(one, two), 3)