I have code, for work, in: FoxPro, Delphi, Python, VB, VB.NET, C#, F#, Obj-C, Swift, Rust, Sql, Js.
I rewrite apps and codebases, and move them. I rewrite the same stuff many times, and make my own pseudo-ORM is my main thing when learn new languages.
Absolutely I'm more productive in some Langs than others:
Amazing at:
- Fox, Delphi, Python (#1), F#, Swift
Average, low:
- VB, C#, Obj-C, Js
Barely move:
- Rust (this is my last lang, and also doing a programming language that I have sketch in python, swift, f#. The task hit against the hardest and weakest parts of rust).
I look at C, C++ and my instinct tell me I will suck forever at them. Same Haskell. Ocalm? I will fly. Lisp? Nope, that crazy stuff never click. Kdb+? I don't know, maybe.
I don't buy the meme "the language not matter, is the people" because languages are made FOR the people. And some stuff click on you or not.
That is the reason APL is a thing for some.