whatishedoing's notebooks

Simple, synchronous CSV conversion of a data set, using CSV Stringify https://csv.js.org/stringify/. CSV parsing libraries are great for handling deceiptively awkward issues, such as commas internal to a field, which can affect numeric types that are formatted!

A quick demonstration of why a library like Papa Parse - https://www.papaparse.com/ - is far superior to string.split(",")!

Why not use a library to test data that should conform to ISO standards? For example, currencies:

Often, configuration data that is represented as a time span will be stored as milliseconds. It's suprising how long it can take to understand a simple calculation, so why not let luxon make the conversion more readable?

The native JavaScript Date library is very, well, _lightweight_, so libraries such as js-joda can help. Once a native date is converted to a js-joda one, with a little (unnecessary?!) help:

URLs are versatile but easy to generate incorrectly, especially when combined from various sources. Fortunately, there are libraries that not only build URLs from their separate parts - scheme, domain, etc. - but also parse and clean badly-formatted ones. Take this example, with extra forward slashes and an unnecessary WWW subdomain:

At some point, you'll need to inspect or scrape web pages for information. Having great libraries makes this process far simpler, so let's see how simple it is to fetch the DOM from a URL using got:

AWS provide IP ranges for their services, in case you'd like to add another layer of security via IP whitelisting. They are available from https://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html, but can be a pain to parse, so let's do that here! First, we'll fetch the data:

Functional programming without side-effects is a great way of ensuring your code is deterministic: that it will run the same each time, regardless of environment. Let's look at a simple attempt to aggregate data from the Star Wars API, https://swapi.co/!