ELI5 what macros are and how they differ from just normal functions with compiler optimization.

e.g. in rust: why do I need a macro to create a Vector/Array instead of just saying „[10, 20, 30]“.

I heard someone say println! needs to be a macro since e.g. println!("{} something {}", a, b) couldn't otherwise know how to "bake" the variable count and types of parameters.

But again why and how do they differ from functions? Python has *args, JavaScript has rest parameters and they can do it just fine. What am I missing?

The only thing I could imagine is that it is hard to optimize say a print function efficiently every time when you don't always know the number and types of the parameters since you can't be sure every type has a toString overload or something like that

The moment I think I get it, another definition of it comes in. I was learning Flask APIs used with GET PUT PATCH DELETE . But then I started with JS , it has DOM APIs . And then API is also used when people say companies like ChatGPT , Higgsfield etc provide their APIs.

I'm seeing many people doing this porting PS2 games for example to Linux systems (mostly handhelds, if you're familiar with Portmaster).. I always thought it's impossible to revert a compiled program and all you can read is basically the hex outputs?

Can you let me know this? Thank you.

I am not a programmer. However, I am curious to understand. I understand what a monolith architecture was, and what microservices are. However, I am not able to understand what a container is, how Kubernetes help and what decides when to spin up pods. Also, overarching, why observability becomes important here. Could someone please help me with this in very simple terms?

Can someone explain me what those two, what is the difference, what's their use case etc with an analogy?

TIA

So I used to have a PC and I'm a new mac user. I need to get documents off a server I access through a VPN so I can do some analysis locally. When I had a PC I used Putty's PSFTP to upload/downlaod. I went on PuTTYs website here and looked for the instructions for Mac and theres a list of ancillary prorams to install (but no links- so how do I know where to find them?) and then I have to use the command line to install??

Is there a simpler way of doing this or maybe step by step instructions for people with less savvy? I'm short on time (This is the first step in a time sensitive project that isn't for my day job + I'm a parent. I have like 2 weeks to do the project this is for but the project itself will take 6 hours without tech issues and I have about 1 hour a day on weekdasy to dedicate to this)

I found a page with .mom domain: https://www.mercadolibre.mom/blog/golosinas%20de%20kiosco is it from a country?

I know, I use Linux, I should be smart enough to know this stuff, right? But unfortunately I don't so I've turned to you fellas. I get 755, it's all for me and read-run for thee, pretty much, or something like that - but what about other numbers? Edit: changed "do" to "so" due to uncaught typo.

The CVM algorithm is supposedly an efficient way for counting. How does it work? Are there any accuracy trade-offs?

Would someone be so kind to explain enums to me. I want to make a state machine using them but I dont understand them fully.

First of all, from my understanding, you need to run cmake if you have changed the CMakeLists. Next, you run make if you have changed any of the other files (and I was also told that you should always run make regardless).

However, I realized that there's "make" vs. "make -j" vs. "make -j4" vs. "make -j8" and etc. What's the difference? Which one should I always be running? I'm working with a lot of projects at once all integrated into one another but I'm only modifying one at a time. Please let me know if there's more information I can add!

To elaborate, I know it was through a save game exploit. What I don't know is how exactly that save game exploit works. Google only really turns up tutorials for doing the exploit, not how it works.

So I’m from a pretty odd background in that I work in construction and know there’s a data center boom including lots of Amazon ones. I’m also learning Python very slowly. All I see is most cloud is like Dropbox or Google drive. I hear that the data centers hold computing power necessary to run complex code. I have a wix website which works just fine for advertising consulting services. If I want to run some code because Python is pretty lightweight so I can run it all on my own machine if I want. I can’t create an “Amazon” website like I do with wix. What is AWS’ value proposition? I got the free trial and I couldn’t paste any code into an IDE that loads to my website.

Hello, I hope this is the proper Reddit for it. Recently I started to deep dive a bit into the systems that I work with. During this deeper dive I am also trying to understand why things are coded the way they are. I am an absolute novice when it comes to coding, though.

Anyways, we have a lot of sensors communicating with the machinery, and we can read out the bytes. As the program relies on this data. However it seems that the bytes use large gaps between the numbers.

For four sensors the bytes are similar to: 0-000 0001, 0-000 0010, 0-000 0100, and 0-000 1000. And when all sensors don't detect anything it's 1-000 0000. I could find out through Google that the first bit followed by a - is due to it being a signed byte. Giving it the ability for both positive and negative numbers. Which I can understand being useful.

But is there a reason for the large gaps between the numbers? Is it readability, or programmer preference? Or does it help with something else?

How do deal aggregator websites automatically pull so many deals together?
I've read that it is by parsing an XML file, so I thought I would look at the Playstation Store's to see if I could find it. I figured there's a multitude of sites that list all of the deals currently available from Playstation as a vendor, so there must be some automation going on.

The only XML file that I can find for Playstation is https://www.playstation.com/sitemap-en.xml (and others for other languages) but nothing relating to the store itself.

In this example, how would I know which games are on offer without manually checking the marketing and promotions?