npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

flat-entries

v1.2.2

Published

This package provides a simple, lightweight and robust way to convert an object to a flat list of all its non-object entries - and of course back to an object.

Downloads

23

Readme

flat-entries

This package provides a simple, lightweight and robust way to convert an object to a flat list of all its non-object entries - and of course back to an object.

npm install flat-entries

🧑‍💻 How to use

The package provides the two functions flatEntries and fromFlatEntries:

flatEntries

You can use it anywhere you would use Object.entries, but the outputs are slightly different:

import { flatEntries } from 'flat-entries';

const obj = {
  prop: 'value',
  nested: {
    prop: 'nested value',
  },
};

// built-in Object.entries keeps object values:
const entries = Object.entries(obj);
/**
 * [
 *   ['prop',   'value'                 ],
 *   ['nested', { prop: 'nested value' }],
 * ]
 */

// flatEntries flattens all nested object values:
const flattenedEntries = flatEntries(obj);
/**
 * [
 *   [['prop'],           'value'       ],
 *   [['nested', 'prop'], 'nested value'],
 * ]
 */

The returned entries always consist of an array of keys (= layers of the object) and the flat value.

fromFlatEntries

Use your favorite array manipulation functions like map, filter etc. to process the entries. Similar to Object.fromEntries, if you want to convert them back into a multi-layer object again or create one from scratch, you can use fromFlatEntries:

import { flatEntries, fromFlatEntries } from 'flat-entries';

const obj = {
  prop: 1,
  nested: {
    prop: 2,
  },
  too: {
    many: {
      layers: 3,
    },
  },
};

const updatedEntries = flatEntries(obj)        // example:
  .filter(([keys, _]) => keys.length < 3)      // remove entries with 3 or more layers
  .map(([keys, value]) => [keys, value * 10]); // and multiply values by 10

const newObj = fromFlatEntries(updatedEntries);
/**
 * {
 *   prop: 10,
 *   nested: {
 *     prop: 20,
 *   },
 * }
 */

⚙️ Options

You can pass an options object as the second parameter to flatEntries:

| option | value | default | effect | |-------------------------|------------------------------------|---------|------------------------------------------------------------------------------------------------------------------| | preserveValuesForKeys | string[]list of object keys | [] | object values at the specified keys will be preserved, i.e. not be flattened (regardless of layer in the object) |

import { flatEntries } from 'flat-entries';

const obj = {
  flatten: {
    but: {
      keep: {
        this: 'object'
      },
    },
  },
};

const flattenedEntries = flatEntries(obj, { 
  preserveValuesForKeys: ['keep'],
});
/**
 * [
 *   [['flatten', 'but', 'keep'], { this: 'object' }],
 * ]
 */

✨ Key features

  • 🔄 two-way conversion, where flatEntries is inverted by fromFlatEntries
  • 💾 all non-object values are preserved, including undefined, null, arrays and even functions
  • 🔒 also works with class instances with private members
  • 🪶 super lightweight, no peer dependencies
  • fully typed when used with Typescript - comes with a FlatEntry<T> type for the flat entries

📖 Changelog

  • 2023/07/23 [1.0.0] initial release of flatEntries and fromFlatEntries
  • 2023/07/27 [1.1.0] add preserveValuesForKeys option
  • 2023/08/11 [1.2.0] add JSDoc and remove some type noise
  • 2023/08/14 [1.2.1] fix re-export to enable top-level import of FlatEntry type