Latest Posts

  1. Technical Writing Tips

    Sunday, Aug 12 2018

    Writing my React book has been humbling: I wasn’t as good a writer as a I imagined. Here’s some what I’ve learnt working with my editor.

    Read More

  2. Backing up MySQL with Percona XtraBackup

    Wednesday, Jun 27 2018 in startup

    The logical backup created by mysqldump was just 430MB. but for testing I wanted to repeatedly tear down and restore the same database. The restore was too slow even after disabling foreign key checks and unique checks.

    I decided to try Percona XtraBackup. Here’s how I completed a full backup and restore. For incremental backups, you must do things a little differently, but I won’t handle incremental backups in this post.

    Read More

  3. The Sociology of Input Validation

    Friday, Jun 15 2018 in architecture

    Maybe writing programs that accept whatever data comes in, and dealing with the consequences later, isn’t as sloppy as it sounds.

    Read More

  4. Havoc with Hibernate Filters and Inheritance

    Sunday, Jun 10 2018 in java

    After migrating from Hibernate 3.6 to Hibernate 5.2, our web framework would sometimes fail mysteriously to bind controller method arguments to the corresponding persistent entity. The cause turned out to be an obscure interaction between JPA’s single table inheritance and a misconfigured Hibernate filter.

    Read More

  5. Smart Mistakes Are the Worst

    Tuesday, May 22 2018 in architecture

    When writing bad code, playing smarter sometimes gives the worst results.

    Read More

  6. How to wrap a web REST API

    Wednesday, Apr 4 2018 in java

    When calling into a third-party REST API, it’s OK to define high- and low-level operations, and leave out the middle.

    Read More

  7. Lone Heroes on Software Projects

    Sunday, Mar 25 2018

    On a software project, communicate to colleagues, managers and clients when you’re in trouble:

    Read More

  8. Bit Twiddling

    Monday, Mar 12 2018 in mathematics

    Bit operations preserve De Morgan’s laws. Bit values are sequences of symbols. What makes them behave like booleans? Where does the essence of a boolean lie?

    Read More

  9. Validate like a Native with React

    Sunday, Feb 25 2018 in react javascript

    Validating a form doesn’t always require a lot of code. With HTML5 constraint validation, you can describe form validation rules with HTML attributes on the form fields.

    For example, to enforce that an <input> element should not be empty, add the required attribute to the element:

    <input id="name" name="name" required/>

    You can use HTML5 constraint validation even with React. Let’s look at an example.

    Read More

  10. How to turn an HTML form into JSON

    Saturday, Feb 24 2018 in javascript

    To send data from an HTML form to a JSON API, you can extract all the form data in one go with form-serialize.

    Read More

  11. React and refs, an eternal love story

    Tuesday, Feb 20 2018 in react javascript

    As in our previous exercise, we want to get the DOM node for a form component to validate the form with the HTML constraint validation API.

    Since React 16.3, we can store references to DOM nodes with React.createRef(). Let’s repeat the exercise with the new API.

    Read More

  12. React, forms and DOM nodes

    Monday, Feb 19 2018 in react javascript

    To validate a form with the HTML5 constraint validation API you need to call .checkValidity() on an actual <form> DOM node. With a custom React form component, how would you access the constraint validation API inside a parent component?

    Read More

  13. 3 Ways to Fine-tune Presentational Components

    Saturday, Feb 17 2018 in javascript react

    Here are three ways to make React presentational components work as re-usable building blocks.

    Read More

  14. React and the mysteries of this

    Friday, Dec 1 2017 in react javascript

    What’s going on with this in JavaScript and what does bind() do? Let’s explore how this behaves in JavaScript and learn why the React documentation recommends calling bind() on some methods in your class component constructors.

    Read More

  15. Introducing React Lifecycle Methods

    Wednesday, Nov 1 2017 in react javascript

    So-called lifecycle methods come in handy to change the default way React renders elements, like if you want to manipulate the DOM directly or compare the previous and the current props. In this post, we’ll examine three of the most common lifecycle methods. Since you can only use lifecyle methods in class components, let’s remind ourselves the difference between class and function components.

    Read More

  16. Three Steps to Learn React

    Saturday, Sep 16 2017 in react

    Have you looked at the React documentation already, but are still confused about how to go about building your first prototype? Try these steps on the path to React mastery.

    Read More

  17. 3 Web Servers for Frontend Developers

    Sunday, Sep 10 2017 in javascript

    Ever needed to quickly start a web server to check a few scripts you’ve been developing locally? Front-end developers don‘t need long complex set up: they can create an HTML file, include some JavaScript and open the file in the browser. But loading files directly from disk causes a few issues: absolute URLs like /mystyle.css don’t load correctly. And requesting any kind of assets via Ajax calls will fail in Chrome because of cross-origin security policies (scripts aren‘t allowed o load files from your local hard drive).

    Read More

  18. I did everything right… and npm throws EINTEGRITY errors!

    Saturday, Sep 2 2017 in javascript

    In my React book, I explain how to download your frontend project dependencies with npm; in this blog post I am going to explain how to recover from an oddball error that I’ve come across once or twice.

    Read More

  19. Make small React components

    Sunday, May 21 2017 in react frontend

    The more I experiment with React, the more I find small presentational components are the way to go. Take this markup for a panel component:

    Read More

  20. Create a Cloudfront distribution for an S3 website

    Tuesday, May 9 2017 in devops frontend

    The HTTPS protocol encrypts the data between your website and the browser; it makes it harder for third-parties to inject their content into your website and may boost search rankings. You can’t use HTTPS if you’re hosting a website on an S3 bucket on your own domain. To serve your S3 website with HTTPS, one solution is serving your website through the Amazon Cloudfront CDN.

    Read More