What were some of the toughest technologies and concepts for you to grasp along the way?

What were they, did you every fully overcome your confusion?

Comments

[Pedro José Piquero Plaza]

Kubernetes. In fact, I am still on it.

[Charlie Mordant]

Reactive programming made properly: RxJS or/and Reactor.

Other:

• Spring cloud (stream+eureka+ribbon+feign+oauth2)
• Oauth2 identity brokering
• Data engineering (ETL, Data Vault, Kafka, Dimensional mode, Olap)
• Observability/tracing (Zipkin)
• Ansible is also sometimes fun ;-). ...

[Leonardo Mangano]

Ownership model in Rust

[ADS-BNE]

React for me.

I was very familiar with using JS on a website, so I thought React would be an easy transition. Nope. What stung me was:

• React is compiled locally. If you're not used to that and how it works then its a pain to get started. When I learnt JQuery ages ago I started with something very, very small eg $(".mydiv).text("hello world");. This worked and I was able to build upon that and create more and more complex DOM manipulations from there. With React you can't just start with that one line.
• React has a lot of dependancies that don't make sense at first. Node, npm, React-DOM. In most beginner React tutorials there is little to no explanation of these. Initially I thought I would have to learn Node.js in and out before I learnt React - and that's a totally different kettle of fish.
• React tutorials are inconsistant. Some are very old, some predate React Hooks, some use TypeScript, some don't use Create React App, some presume prior knowledge of things like Redux.
• It's not intuitive to actually deploy a React component or app up on a live site. Most React tutorials end at the point where you've completed the app on your local machine... cool, but now what? How do I actually get it on my site?

[Manuel Artero Anguita 🟨]

OAUTH

I've read and even studied several times. My mind just go blank for some reason.

[BaasMurdo]

Sockets (as in WebSockets), not coding them, that was the easy part.
But actually understanding why and how they work with multiple sessions and clients.

[Sarang]

And Flex is all you need 😅

[Bryan M]

Containers and Kubernetes, for my first internship I was thrown into the cloud computing world and I had no prior knowledge of it at all. It took a week to figure out what exactly a container was and why containerized apps are crucial to today's CI/CD.

And kubernetes..... don't get me started with that. Something I'm still trying to figure out until this day xD

[Joe Sweeney]

I disliked JavaScript greatly for many years. I just didn't get how to use it, coming from mostly object-oriented languages (Java, C++, even PHP 5 and above). Then, one day, a switch flipped and suddenly I thought it was actually pretty fun! I think it took just embracing a new mental model and embracing/getting over some of its quirks.

[crayoncode]

Some concepts of Functional Programming like pure functions and monads. To this day I cannot reconcile/fully understand the idea of functions without side-effects and basically no external state that does not depend on the function's arguments with what I know about programming. I simply could not find a consistent approach on how to build the applications I code on a daily basis using pure functional programming and I would trade my right arm for a look at a codebase of a buisness application that fully embraces FP.