Tutorials

Testing authentication can be difficult, especially with many 3rd party providers like Auth0. We'll show how to use Jest and mock-jwks to test out your authentication to create fast unit tests with out hacks.

Animations can be used to effectively communicate a users action. However many times the reverse animation is used for both a close, or success. We can do better, and we'll walk through how to use Animated to create 2 different animations with a single animated value.

We'll tackle setting up user types by creating a users_types table with a value text primary key. We'll add the users type as a foreign key to our new table. Finally we'll insert values as a SQL query and track it as a migration.

We'll use position: sticky to lock our sticky header to the content container that it's in when the user scrolls. Using a useEffect hook we can monitor the scroll position and determine if the user is looking at a section of our content. If they are we can update a useState hook to highlight it in our nav bar. Finally we'll add a scroll to section feature as well.

We'll build a circular progress button to show how far a user has read an article. The techniques will rely on stroke-dasharray and stroke-dashoffset. Using the useLayoutEffect hook and useRef hook we will measure our article height dynamically and calculate progress based upon the scroll position. We'll show how to dynamically calculate all necessary values to render our progress circle exactly where we want it.

Routes are some times better served as a modal. If you have a modal (like a login modal) that needs to be routeable and appear on all pages you may need to use query params. Will explore how to render a route all the time and use query params to control when it's content renders

Often times there is a route that is better served as a modal. You want to be able to link to it and still render the page behind it. With React Router this can be accomplished. We'll dive into rendering a route with a route that renders as a modal.

We'll explore how to use Unified, Remark, Rehype, and PrismJS to create markdown code that is capable of being syntax highlighted. The generated code will be React elements instead of a string of HTML. This adds in the security benefits of React when it comes to rendering untrusted markdown content.

In this lesson we'll show how to enable the PostGIS extension on RDS. We'll then walk through using Knex to create a table to store gps coordinates. Then we'll construct queries for saving, updating, and querying for coordinates within a radius. Finally we'll use knex-postgis plugin for Knex to generate queries from helper functions.

Undo capabilities can be complicated to add to any application. We'll dive into how we can use the Immer library to lend us a hand in managing our state and making undo easy.