Not a psychological effect. 2x is a single term. You can write it as 2 * x but then you should wrap it in paranthesis if you are replacing it in an expression. When you expanded the expression by adding just a *, you actually changed the expression.

Hmm. What's 8 ÷ 2x when x = 4?

I found a way to zip it and make it available for download in browser itself here , without using any backend server code. So you can store your binaries and your website in any static file server, or even in github and make this work. It might lead to prerfomance issues in some clients, but assuming that the client machine can run your Electron application, this shouldn't cause much issues in the browser.

This works. console .log(args.reduce((a,b)=> a*b));

My go-to language for everything is C#, even though lately I am interested in Javascript a lot. I had to work with and debug an application written in PERL a few years back. Hated every second of it. Later I discovered that it's jokingly called as a "write-only language", and I agree to it at the fullest.