71 lines
2.3 KiB
Markdown
71 lines
2.3 KiB
Markdown
# fromentries [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][downloads-url] [![javascript style guide][standard-image]][standard-url]
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[travis-image]: https://img.shields.io/travis/feross/fromentries/master.svg
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[travis-url]: https://travis-ci.org/feross/fromentries
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[npm-image]: https://img.shields.io/npm/v/fromentries.svg
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[npm-url]: https://npmjs.org/package/fromentries
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[downloads-image]: https://img.shields.io/npm/dm/fromentries.svg
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[downloads-url]: https://npmjs.org/package/fromentries
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[standard-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg
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[standard-url]: https://standardjs.com
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### Object.fromEntries() ponyfill (in 6 lines)
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## Install
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```
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npm install fromentries
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```
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## Why this package?
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Existing polyfill packages (like
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[`object.fromentries`](https://github.com/es-shims/Object.fromEntries))
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pull in a bunch of dependencies and **adds over 8
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KB** to the browser bundle size. This allows them to work in ES3 environments
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like IE6, but it's also overkill; almost no one supports IE6 anymore.
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I'd rather not ship tons of extra code to website visitors. A polyfill for this
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feature can be implemented in a few short lines of code using modern language
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features. That's what `fromentries` (this package) does.
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This means that `fromentries` only works in evergreen browsers like:
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- Chrome
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- Firefox
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- Edge
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- Safari
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- Opera
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It does not work in browsers like IE11 and older (unless you transpile it first).
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## Usage
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```js
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const fromEntries = require('fromentries')
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const map = new Map([ [ 'a', 1 ], [ 'b', 2 ], [ 'c', 3 ] ])
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const obj = fromEntries(map)
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constole.log(obj) // { a: 1, b: 2, c: 3 }
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const searchParams = new URLSearchParams('foo=bar&baz=qux')
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const obj2 = fromEntries(searchParams)
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console.log(obj2) // { foo: 'bar', 'baz': 'qux' }
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```
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## What is a ponyfill?
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> A *ponyfill* is almost the same as a polyfill, but not quite. Instead of
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> patching functionality for older browsers, a ponyfill provides that
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> functionality as a standalone module you can use.
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Read more at [PonyFoo](https://ponyfoo.com/articles/polyfills-or-ponyfills).
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## See also
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- [TC39 proposal for Object.fromEntries](https://github.com/tc39/proposal-object-from-entries)
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## License
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MIT. Copyright (c) [Feross Aboukhadijeh](http://feross.org).
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