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weakmap-shim

1.1.1
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A minimal weakmap shim

Package Exports

  • weakmap-shim
  • weakmap-shim/create-store

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (weakmap-shim) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

weakmap-shim

A minimal weakmap shim

Example

var weakMap = require("weakmap-shim")

var map = weakMap()
var key = {}

map.set(key, 'some value')
var v = map.get(key) // 'some value'

create-store Example

var createStore = require('weakmap-shim/create-store')

var store = createStore()
var key = {}

var value = store(key)

// `value` is weakly bound to `key`. `value` is a plain object
value.foo = 'bar'

var value2 = store(key)

var v = value2.foo; // 'bar'
var bool = value === value2; // true

Motivation

Benvie has an excellent weakmap module that's far more robust. However it contains quite a bit of loc.

  • weakmap : 7451 bytes
  • weakmap-shim : 2106 bytes
  • weakmap-shim/create-store : 1311 bytes

This module is only worthwhile if you want to add a weakmap to a small module (10 - 30 loc) and dont want to bloat it with a heavier weakmap

Installation

npm install weakmap-shim

Contributors

  • Raynos

MIT Licenced