JavaScript Map — Transform to an Object

A previous tutorial showed you how to create a JavaScript Map instance from an existing object. This time we’re doing it the other way around: transforming a JavaScript map into a plain object.

Node.js Series Overview

  1. String Replace All Appearances
  2. Remove All Whitespace From a String in JavaScript
  3. Generate a Random ID or String in Node.js or JavaScript
  4. Remove Extra Spaces From a String in JavaScript or Node.js
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  6. Get the Part Before a Character in a String in JavaScript or Node.js
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  8. How to Check if a Value is a String in JavaScript or Node.js
  9. Check If a String Includes All Strings in JavaScript/Node.js/TypeScript
  10. Check if a Value is a String in JavaScript and Node.js
  11. Limit and Truncate a String to a Given Length in JavaScript and Node.js
  12. Split a String into a List of Characters in JavaScript and Node.js
  13. How to Generage a UUID in Node.js
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  21. Get the Part Before First Occurrence in a String in JavaScript or Node.js
  22. Get the Part Before Last Occurrence in a String in JavaScript or Node.js
  23. Get the Part After Last Occurrence in a String in JavaScript or Node.js
  24. How to Count Words in a File
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  26. Append Characters or Words to a String in JavaScript or Node.js
  27. Check if a String is Empty in JavaScript or Node.js
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  31. Lowercase the First Character of a String in JavaScript or Node.js
  32. Uppercase the First Character of a String in JavaScript or Node.js
  33. Prepend Characters or Words to a String in JavaScript or Node.js
  34. Check if a String is a Number
  35. Convert a String to Buffer

Create a JavaScript Object From a Map

Modern JavaScript engines ship with the Object.fromEntries() method. Creating an object from entries is what you’re looking for when creating a plain object from a map instance.

Here’s an example transforming a map of users to an object:

const map = new Map()  
map.set('marcus', { name: 'Marcus' })  
map.set('norman', { name: 'Norman' })  
map.set('christian', { name: 'Christian' })

const usersObject = Object.fromEntries(map)  

Use the @supercharge/map Package

I’m the maintainer of the @supercharge/map package providing a better Map class for JavaScript.

The @supercharge/map package provides a .toObject() method allowing you to transform the map instance to a plain JavaScript object:

const Map = require('@supercharge/map')

const users = new Map()  
    .set('marcus', { name: 'Marcus' })
    .set('norman', { name: 'Norman' })
    .set('christian', { name: 'Christian' })

const obj = users.toObject()  
// {
//   'marcus': { name: 'Marcus' }
//   'norman': { name: 'Norman' }
//   'christian': { name: 'Christian' }
// }

Sweet!


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