Still going with the Bulma course and have I told you I found one super cool about creating a color in tool in React? Yeahh so much interesting stuff around...
On the JS course I started, I've learned about prototype pollution and paying attention to third-party that may have vulnerabilities by using not so safe JS idioms.
I learned about generator functions in JS. They can be paused and resumed at any moment. There was an example of a continuously running function which reminded me about lazy evaluation in Haskell. The function only gives you a value when you ask for it.
I learned about making custom Iterators in JS and there are 3 options in the spec. One for getting the next value, for pausing the iteration, and for handling errors.
Fun fact I learned from Kevin Cunningham: If you put the word "box" in a GitHub repo address before the '.com'. It launches you into a CodeSandbox session with the code of that repo ready for you to play around with.
I learned about Iterators and Iterables in JS. The for..of loop already uses them under the hood and the 'Symbol.iterator' is a "well-known" symbol in JS that's used to make an iterator out of an object.