September 18th, 2020: What did you learn this week?

It's that time of the week again. So wonderful devs, what did you learn this week? It could be programming tips, career advice etc.


Feel free to comment with what you learnt and/or reference your TIL post to give it some more exposure.

#todayilearned Follow

Summarize a concept that is new to you.

Comments

[Kostia Palchyk]

I learned more about Proxies and TypeScript helpers to develop and properly type this:

Turn a Stream of Objects into an Object of Streams

Kostia Palchyk ・ Sep 18 ・ 2 min read

#rxjs #angular #javascript #typescript

Proxy get, set, apply, TS' infer, keyof, ReturnType<Type>, etc — it's MAGIC!

[peter279k]

I develop my hacking scripts and use existed penetration tools to do penetration testing for some websites/services in Taiwan.

And submitting the security issues to the HITCON Zero DAy, a bug exploit submitting service.

[Nick Taylor]

Awesome!

[Jason F]

I learned that it's possible to retrieve data and update it in one SQL query. Also learned a little bit more about mocking in unit tests. Oh, and I made my first nuget package.

[Nick Taylor]