What features should JS Frontend Junior know?

Question

JavaScript

Hello.
I'm learning JavaScript. What elementary functions do you need to learn and understand so that later you can write and understand more complex ones with their help? And in general, what JS functions will I need when developing in this area? The search brings up topics that are asked for interviews, closures, scopes, etc., but you need specific functions that are vital for Frontend.
For example: a 2-argument comparison function will help further in more complex sorting of something.

Answer 1

Well, as an example, here
Also here is my list of interviewing experience, this is more like a middle or a good junior.
Here is a group where all the info on how to prepare for an interview, what to learn and how to live with it, is ideal for juniors
. You don’t need to memorize functions, you need to understand how to implement them. In the frontend, the jun, as a rule, will have to receive data via api. render lists, do array filters, do field validation through regular expressions, add and remove home elements.
If you need help - write, I will help :)

Answer 2

Better immediately like this: https://learn.javascript.ru/
All. Jun is someone who knows almost everything (the basics at least), but he has no / little experience on real projects.
ps in general, the concept of jun / middle / senior is too vague)

Answer 3

1) Know where to look. Approximately represent what is. Nobody remembers everything. For example, under the frontend (browsers): https://developer.mozilla.org/ru/
2) Stop thinking at the "learn functions" level. This is not joon level. It's trainee level yet.