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About Nicholas C. Zakas
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Blog postIn the previous posts in this series, I discussed implementing a promise from scratch in JavaScript. Now that there’s a full promise implementation, it’s time to look at how you can monitor multiple promises at once using Promise.race() and Promise.any() (Promise.all() and Promise.allSettled() will be covered in the next post). You’ll see that, for the most part, all of the methods that work with multiple promises follow a similar algorithm, which makes it fairly easy to move from implementin
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Blog postWhen 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 as soon as they are created. These methods are helpful for wrapping known values in promises without going through the trouble of
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Blog postIn 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 one.
This post focuses on implementing then(), catch(), and finally() according to ECMA-262. This functionality is surprisingly involved and relies on a lot of hel -
Blog postIn 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 promise, which will trigger asynchronous operations.
As a reminder, this series is based on my promise library, Pledge. You can view and download all of the source co -
Blog postEarly 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 apart and put it back together again. That’s why, when I decided to deepen my understanding of promises, I started thinking about creating promises from scratch.
Yes, I wrote a book on ECMAScript 6 i -
Blog postGitHub 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 workflow completes, there isn’t much risk of abuse inside of the system. There is a risk, however, to your data.
This post is aimed at -
Blog postEarly 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 not, why are there managers, designers, product managers, salespeople, etc.?). I slowly came to see myself less as a coder and more as a problem solver. Sometimes the problem coul
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Blog postLast 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 events is a schedule defined in start cron format. So now instead of using AWS to schedule a cron job to deploy my static site, I use a GitHub Action.
For the sake of compl -
Blog postI’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 was used to other services like Netlify2 and AwS Lambda3 exposing environment variables in the web interface to allow secure transmission of important information. When Vercel did
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Blog postOne 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 them during site generation. This is a really useful capability that I wanted to take advantage of to output Markdown for use in other sites. Places like Medium and dev.to allow you to post
Books By Nicholas C. Zakas
JavaScript de Alto Desempenho: Construa interfaces mais rápidas para aplicações web (Portuguese Edition)
Apr 8, 2020
$10.99
Other Formats:
Paperback
$11.99
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