Today I Learned
When working with type systems in programming languages like TypeScript, Scala, Java, or even Python (via type hints), you'll encounter the concepts of covariance and contravariance. These terms describe how the subtype relationships of generic types behave when you substitute their type parameters. Understanding them can help you
Today I Learned
useEffects have a lot of footguns, especially with the dependency list. This is one of them. If I have a web worker that I need to communicate with, I need to have a message handler. The message handler needs to change the state of my frontend application. It's
Today I Learned
In Lisp, you can quote an expression to delay its evaluation while passing it around as a value. In Python, this means in practice, I want a function that looks like it's executing, but reality, I'm delaying its actual execution. I can use decorators to achieve