Gergely Polonkai Well I am doing the same thing like you 😂 That's why I spend more time on backspace, I still have a long way to go.

Mike Chilson Thanks MikeChilson, I would take a look!

I can type blindly, but I would spend more time on backspace. Well ... Btw, how do you guys practice blind typing ? Just form it naturally or practice intentionally ? (i.e. follow some technology or practice website?)

React is not two-way-bind for your local variable arr , so no matter how much time your arr changed, React will just ignore, it only care about state. The concept in render() function is simple: what you can see in your page, depends on what you have return from render() function, so if you want to see the changing process of your arr , you should set a state for that variable, and every time your state change(for example use setState() function), the render() function would called, and your page would be rerendered then, so you can see the change. Plus, try not set side-effect function(in your case is window.onload=... and setInterval ) inside render() function, do that stuff in lifecycle function, checkout the doc: https://reactjs.org/docs/react-component.html

Well, when everything works well, I prefer editors like VS Code, there are a bunch of nice features and plugins. But when the plugins and features can not satisfied me, or there are bugs in the editor, I would remember the Emacs, maybe just because you can break it down and hack it.

This TV series is a memes producer :p

passwordis123 , true story

You should ask yourself which kind of work you are interested before you ask which language is a good start, cause there is no best among all the scenario. Although the Js is powerful in web field, you may not want use it to develop a proper OS or something that in low level.

Did I sleep last night? If not, when was last time

Take a nap like ~10 minutes, sometimes with soft music on. But if I have a dog or cat, playing with them may would help, I guess.