The object.fromentries npm package is a polyfill for the Object.fromEntries() method, which transforms a list of key-value pairs into an object. This is particularly useful for converting Map objects or arrays of arrays into object literals, allowing for easy manipulation and access of data structures.

What are object.fromentries's main functionalities?

Converting Map to Object

This feature allows for the conversion of Map objects to plain objects, making it easier to work with and access data stored in Maps.

const map = new Map([['foo', 'bar'], ['baz', 42]]);
const obj = Object.fromEntries(map);
console.log(obj); // Output: { foo: 'bar', baz: 42 }

Converting Array of Arrays to Object

This feature enables the transformation of an array of arrays (each inner array representing a key-value pair) into an object, simplifying the process of creating objects from structured data arrays.

const entries = [['foo', 'bar'], ['baz', 42]];
const obj = Object.fromEntries(entries);
console.log(obj); // Output: { foo: 'bar', baz: 42 }

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Readme

Source

object.fromentries

An ES spec-proposal-compliant Object.fromEntries shim. Invoke its "shim" method to shim Object.fromEntries if it is unavailable or noncompliant.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the proposed spec.

Most common usage:

var assert = require('assert');
var fromEntries = require('object.fromentries');

var obj = { a: 1, b: 2, c: 3 };
var actual = fromEntries(Object.entries(obj));

assert.deepEqual(obj, actual);

if (!Object.fromEntries) {
	fromEntries.shim();
}

assert.deepEqual(Object.fromEntries(Object.entries(obj)), obj);

Tests

Simply clone the repo, npm install, and run npm test

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Last updated on 18 Mar 2024

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