https://github.com/stefanpenner/blank-object

https://github.com/stefanpenner/blank-object

Last synced: 17 days ago
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• Host: GitHub
• URL: https://github.com/stefanpenner/blank-object
• Owner: stefanpenner
• Created: 2015-09-03T20:45:19.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2016-08-05T15:50:58.000Z (over 8 years ago)
• Last Synced: 2024-10-17T18:13:16.053Z (19 days ago)
• Language: JavaScript
• Size: 3.91 KB
• Stars: 1
• Watchers: 4
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# blank-object

Object.create(null) turns out to be quite slow to alloc in v8, but instead if

we inherit from an ancestory with `proto = create(null)` we have nearly

the same functionallity but with dramatically faster alloc.

```js

var BlankObject = require('blank-object');

var bo = new BlankObject();

```

This is designed for a presence check `map[key] !== undefined` since `in` is also slow like `hasOwnProperty`, `delete` and `Object.create`.

```js

function UNDEFINED() {}

export default class Map {

  constructor() {

    this.store = new BlankObject();

  }

  has(key) {

    return this.store[key] !== undefined;

  }

  get(key) {

    let val = this.store[key];

    return val === UNDEFINED ? undefined : val;

  }

  set(key, val) {

    this.store[key] = val === undefined ? UNDEFINED : val;

  }

}

```