About Nicholas C. Zakas

Recent Posts

Creating a JavaScript promise from scratch, Part 4: Promise.resolve() and Promise.reject()

When you create a promise with the Promise constructor, you’re creating an unsettled promise, meaning the promise state is pending until either the resolve or reject function is called inside the constructor. You can also created promises by using the Promise.resolve() and Promise.reject() methods, in which case, the promises might already be fulfilled or rejected... […]

Creating a JavaScript promise from scratch, Part 3: then(), catch(), and finally()

In my first post of this series, I explained how the Promise constructor works by recreating it as the Pledge constructor. In the second post in this series, I explained how asynchronous operations work in promises through jobs. If you haven’t already read those two posts, I’d suggest doing so before continuing on with this... […]

Creating a JavaScript promise from scratch, Part 2: Resolving to a promise

In my first post of this series, I explained how the Promise constructor works by recreating it as the Pledge constructor. I noted in that post that there is nothing asynchronous about the constructor, and that all of the asynchronous operations happen later. In this post, I’ll cover how to resolve one promise to another... […]

Creating a JavaScript promise from scratch, Part 1: Constructor

Early on in my career, I learned a lot by trying to recreate functionality I saw on websites. I found it helpful to investigate why something worked the way that it worked, and that lesson has stuck with me for decades. The best way to know if you really understand something is to take it... […]

How to safely use GitHub Actions in organizations

GitHub Actions1 are programs designed to run inside of workflows2, triggered by specific events inside a GitHub repository. To date, people use GitHub Actions to do things like run continuous integration (CI) tests, publish releases, respond to issues, and more. Because the workflows are executed inside a fresh virtual machine that is deleted after the... […]

How I think about solving problems

Early on in my career as a software developer I thought my primary contribution was writing code. After all, software engineers are paid to ship software and writing code is a key component of that. It took several years for me to realize that there are numerous other contributions that go into shipping software (if... […]

Scheduling Jekyll posts with Netlify and GitHub Actions

Last year, I wrote about how to schedule Jekyll posts using Netlify and AWS Lambda[^1]. I used that approach from the moment I wrote that blog post up until today. What changed? In the past year, GitHub has introduced GitHub Actions[^2], a way to run container jobs triggered by different GitHub events. One of those... […]

Securing persistent environment variables using Vercel (formerly Vercel)

I’m a big fan of Vercel1 as an application hosting provider. The way the service abstracts all of the cloud computing details and allows teams to focus on building and deploying web applications is fantastic. That said, I had a lot of trouble setting up secure environment variables for my first application to use. I... […]

Outputting Markdown from Jekyll using hooks

One of the things I most enjoy about Jekyll1 is writing my blog posts in Markdown. I love not worrying about HTML and just letting Jekyll generate it for me when a post is published. Using Liquid tags directly in Markdown is also helpful, as I can define sitewide or page-specific variables and then replace... […]

Computer science in JavaScript: Circular Doubly-linked lists

In my previous post, I discussed what changes are necessary to turn a singly linked list into a doubly linked list. I recommend reading that post before this one (if you haven’t already). This post is about modifying a doubly linked list (also called a linear doubly linked list) in such a way that the... […]