Obviously it's totally fine to have a difference of opinion for something like this. > I have seen people do this in JavaScript quite often, but I always assum

Obviously it's totally fine to have a difference of opinion for something like this. > I have seen people do this in JavaScript quite often, but I always assumed there was some kind of underlying performance benefit that I didn't know about. I don't think so, at least I haven't heard of it if there is. I tend to have a rule of thumb of "if it's more than 6-7 lines, give it a name". That's not a strict rule, but it's something I try and force myself to do. Like in Python, most lambdas can be done in one line, but that also kind of gets into a separate bit of gross logic, because you might try and cram as much into an expression as possible. Like, in my example, it could be written like this: [1,2,3,4].filter(x =>((x * 2) + x * (x/2)) % 27 == 2); But now I have one giant-ass expression because I put it all into one line. Now where previously I had two extra names for the variables, I have the ad-hoc logic shoved in there because I wanted to squeeze it into a lambda.