A step by step article explaining how to create a simple Slack Bot using Crystal programming language and deploy it to Heroku.
Checkout the Mint/Crystal recipe: a client/server application using Mint framework.
In this article, the author shared his experience building a Rails API and a post-migration to Crystal. He was about to implement a Genetic Algorithm for the Travelling Salesman Problem, but after a struggle with Ruby on Rails processing speed, the code base was moved to Crystal and deploy using AWS Lambda.
Head to head comparison of Crystal and TypeScript from Alex Craft.