controlled | Tiny Safari extension that adds standard HTML controls | Video Utils library

I'm trying to understand best practices for Golang concurrency. I read O'Reilly's book on Go's concurrency and then came back to the Golang Codewalks, specifically this example:

https://golang.org/doc/codewalk/sharemem/

This is the code I was hoping to review with you in order to learn a little bit more about Go. My first impression is that this code is breaking some best practices. This is of course my (very) unexperienced opinion and I wanted to discuss and gain some insight on the process. This isn't about who's right or wrong, please be nice, I just want to share my views and get some feedback on them. Maybe this discussion will help other people see why I'm wrong and teach them something.

I'm fully aware that the purpose of this code is to teach beginners, not to be perfect code.

Issue 1 - No Goroutine cleanup logic

Alright, so I'm making a game in Unity, and I tried to spawn in enemies randomly around a player. To control the rate of the spawning, I created a private bool spawnCooldown variable. Then, there was an if {} statement which controlled the rate of spawning. The original code is below:

Expectation

React Hook form should show the error message when we clear the input field with a cross button

Issues

1. Required error message not shown after the value is cleared with the cross button.
2. After clearing value with cross button submit button is not disabled.

I was reading about the vulnerability of deserializing types with Json.Net using a setting different from TypeNameHandling.None. The Json.Net docs recommend implementing a custom SerializationBinder. A simple example of a custom binder that checks types against a list of known types is given here.

While this solution certainly works, the set of known types is not fixed in my scenario, since the application has to support extensions, which might define their own data classes. One solution would be to extend the known type list during the registration of an extension, however, I had a second approach in mind, that I'd like to verify:

I want to define a common interface for trusted types:

(suggested by dbc: A custom attribute could be used instead of a marker interface.)

I installed a Kubernetes cluster of three nodes, the control node looked ok, when I tried to join the other two nodes the status for both of is: Not Ready

On control node:

I'm using javascript (React, but I don't think this is specific to React) to handle a form submit. None of my elements are controlled, and I'd like to keep it that way. I may not know beforehand exactly what the form elements are, how many there are, etc. I just want to grab whatever is in the form and send it wherever it needs to go.

I'm doing some logging in the event handler so I can inspect event.target.elements and it's a bit confusing. It seems to look like both an indexed array and an object at the same time, with each form element getting a numeric entry and a named entry. It has a length property equal to the length of the number of numeric entries (ignoring the named entries), but if I try to use a .forEach directly on it, I get the error event.target.elements.forEach is not a function. If I use Object.entries to loop over it, both the numeric and the named entries are logged. But if I use lodash to loop over it, I just get the numeric entries.

I'd just like to know what exactly is going on. If event.target.elements is not an array, why does it have a length property? If it is an array, why can't I use a regular forEach directly on it?

My form submit event handler looks something like this, for testing/learning purposes:

I would like to design a query where I can combine two jsonb with an unknown number/set of elements in postgreSQL in a controlled manner. The jsonb operator || almost exactly fits my purpose, but for one of the jsonb elements I would like to concatenate and separate by comma the two values rather than having the second jsonb's value override the first's value. For example:

I have researched this topic for quite some time now, yet I still cannot make the 'Remove' button in the child component (ControlledOpenSelect) only remove the item with the key it was passed - by using the callback function.

My ControlledOpenSelect (the child component):

I am using react-hook-form and using third party DatePicker. Since it's a custom component using it as a controlled component to register it. This works fine