Code with Hugo

In computer science, test coverage is a measure used to describe the degree to which the source code of a program is executed when a particular test suite runs. Code coverage - Wikipedia Code coverage is usually used as a quality metric for software eg. “Our code has to have 80 ...

An example Netlify Lambda to fetch all “newsletter” posts from Pocket. Pocket is an application and web service for managing a reading list of articles from the Internet. It’s quite widely used and tightly integrated into the Firefox browser. I find that I use it extensiv ...

There are situations where new Date() or Date.now is used in application code. That code needs to be tested, and it’s always a struggle to remember how to mock/stub or spy on Date.now/new Date with Jest. This post goes through multiple approaches to mocking, stubbing and spying o ...

A case-study on where recursion can be useful for enterprise Node.js applications and how to avoid its common pitfalls like RangeError: Maximum call stack size exceeded. The full repository for this post is on GitHub: github.com/HugoDF/mongo-query-clause-modification We’ll ...

When asked to handle data in a request body, developers who have used Express (the “Fast, unopinionated, minimalist web framework for Node.js”) before, reach for the body-parser library. What they might not know is that body-parser is a dependency of Express and its main JSON par ...

The ES2015 or ES6 specification introduced class to JavaScript. Libraries like React went from React.createClass to class MyComponent extends React.Component, ie went from rolling their own constructor to leveraging a language built-in to convey the programmer’s intent. For a Nod ...

With Jest it’s possible to assert of single or specific arguments/parameters of a mock function call with .toHaveBeenCalled/.toBeCalled and expect.anything(). The full example repository is at github.com/HugoDF/jest-specific-argument-assert, more specifically lines 17-66 ...

The why and how of enterprise-style Node.js application. A setup that’s easy to test and extend using battle-hardened technologies like Express.js, Postgres and Docker Compose to run locally. Dive into the code on GitHub directly: github.com/HugoDF/express-postgres-starter. ...

Despite the JavaScript Date warts, it’s straightforward to add days to a date in JavaScript. While it would be very easy to reach for moment.js or another date manipulation library (date-fns, luxon, dayjs) to do something as simple as adding days to a Date in JavaScript, wr ...

This post goes through how to reduce the amount of static assets served through Netlify by leveraging a CDN (Content Delivery Network) like Cloudflare. This will reduce your Netlify bandwidth usage for cacheable assets. It will also mean that you’re following industry-accepted be ...