When it comes to making modifications to objects and arrays, adding or changing keys to objects can be a cumbersome task. But with the spread operator (…), you have a simple way of doing it.

Use popular 'grammar of data' syntax to filter and subset your two-dimensional JavaScript arrays and more. Here's how to use Arquero for data wrangling in Observable JavaScript and Node.js.

This tutorial provides a comprehensive guide to JavaScript Map and Set, explaining their differences, use cases, and how to use them.