How to Assign Array Values to Object Keys in JavaScript

Discover how to efficiently assign values from an array to object keys in JavaScript with clear examples and explanations.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How can I assign array values into object keys for other object?

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Assign Array Values to Object Keys in JavaScript

In JavaScript, it’s common to manipulate arrays and objects. One problem that often arises is the need to assign values from an array to object keys within another object. If you’ve ever faced this challenge, you’re not alone. In this guide, we’ll explore a simple yet effective solution to this problem, breaking it down step-by-step.

The Problem

Imagine you have the following two structures:

An array of objects: const a = [{}, {}, {}]

A simple array of boolean values: const b = [true, false, true]

Your goal is to transform the first array so that it looks like this:

[[See Video to Reveal this Text or Code Snippet]]

This means that each object in the first array should now contain a key called value, which should hold the corresponding values from the second array.

The Solution

There are a couple of ways to achieve this, depending on your needs. Let’s explore two methods: one for creating a new array with the desired structure and another that modifies the original array.

Method 1: Creating a New Array

You can use the map() function to create a new array where each boolean value from your second array becomes the value of a key value in a new object. Here's how you can do it:

[[See Video to Reveal this Text or Code Snippet]]

In this code snippet, we're mapping over the array b. For each element el, we create a new object with a value key, holding the current element of the array.

Method 2: Overwriting Elements in the Original Array

If you prefer to overwrite the existing objects in the first array, use forEach() along with the index of the current element to assign values from the second array directly. Here’s how:

[[See Video to Reveal this Text or Code Snippet]]

In this example, we iterate through each element of arr, and by using the index (idx), we set the value key of the current object to the corresponding element from arr2.

Conclusion

Both methods reviewed above allow you to successfully assign values from an array to object keys in JavaScript. Choose the method that best fits your requirements — either create a new array or modify an existing one. Mastering these practical techniques will definitely enhance your JavaScript skills, especially when working with data structures in frameworks like React.

Feel free to test these code snippets in your own projects and see how they perform in various scenarios.