What's New in Mongoose 5.6.0: Immutable Properties

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The 80/20 Guide to JavaScript Arrays

June 11, 2019

JavaScript arrays are an essential part of the language. Fundamentally, an array is a value that stores an ordered list of other values. But JavaScript arrays come with a lot of nuances and surprises. In this article, I'll provide an overview of what you need to know about JavaScript arrays.

Testing Vue Apps with Puppeteer and Mocha

June 05, 2019

Puppeteer is a powerful automation library for Google Chrome. With Puppeteer, you can launch a Chrome browser that you have full control over from Node.js. This makes UI testing easy: your client-side app runs in a real browser, no need to worry about the painful quirks of Jest attempting to mimic a browser in Node.js. Puppeteer runs in headless mode by default, which means the Chrome window isn't visible. But you can still take screenshots in headless mode, or you can disable headless mode and watch your tests click through your app.

The 80/20 Guide to JSON.stringify in JavaScript

May 28, 2019

The JSON.stringify() function is the canonical way to convert a JavaScript object to JSON. Many JavaScript frameworks use JSON.stringify() under the hood: Express' res.json(), Axios' post(), and Webpack stats all call JSON.stringify(). In this article, I'll provide a practical overview of JSON.stringify(), including error cases.

The 80/20 Guide to Promises in Node.js

May 22, 2019

Promises are a built-in concurrency primitive that's been part of JavaScript since ES6 in 2015. The Promise class has been included in Node.js since v4.0.0. That means, unless you're on an unmaintained version of Node.js, you can use promises without any outside libraries.

What's New in Node.js 12: Private Class Fields

May 14, 2019

Private class fields are a Stage 3 TC39 proposal. Even though they're still experimental, you can use private class fields in Node.js 12 without flags or transpilers. In this article, I'll explain the basics of private class fields and how they interact with existing paradigms, like Object.keys() and assert.deepStrictEqual().

Slow Trains in MongoDB and Node.js

May 06, 2019
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