So... I’ve recently started a new role, and luckily I’ve established myself as someone that knows his shit (more or less) TM.

I’m leading the charge on tech debt, and raising issues about it, first on my radar is the monstrosity of their approach to app config.

It’s a web app, and they store config in a key-value table in the database.

Get this. The key is the {type}.{property} path and this is fetched from the database and injected *at construction* via reflection.

Some of these objects get instantiated dozens of times per-request. Eurgh.

StackOverflow locked my account. I'm hoping someone here might be kind enough to help me with a bash script I'm "bashing" my head with. Actually, it's zsh on MacOS if it makes any difference.

I have an input file. Four lines. No blank lines. Each of the four lines has two strings of text delimited by a tab. Each string on either side of the tab is either one word with no spaces or a bunch of words with spaces. Like this (using <tab> as a placeholder here on Devrant for where the tab actually is)

ABC<tab>DEF
GHI<tab>jkl mno pq
RST<tab>UV
wx<tab>Yz

I need to open and read the file, separate them into key-value pairs, and put them into an array for processing. I have this script to do that:

# Get input arguments
search_string_file="$1"
file_path="$2"

# Read search strings and corresponding names from the file and store in arrays
search_strings=()
search_names=()

# Read search strings and corresponding names from the file and store in arrays
while IFS= read -r line || [[ -n "$line" ]]; do
echo "Line: $line"
search_string=$(echo "$line" | awk -F'\t' '{print $1}')
name=$(echo "$line" | awk -F'\t' '{print $2}')
search_strings+=("$search_string")
search_names+=("$name")
done < "$search_string_file"

# Debug: Print the entire array of search strings
echo "Search strings array:"
for (( i=0; i<${#search_strings[@]}; i++ )); do
echo "[$i] ${search_strings[$i]} -- ${search_names[$i]}"
done

However, in the output, I get the following:

Line: ABC<tab>DEF
Line: GHI<tab>jkl mno pq
Line: RST<tab>UV
Line: wx<tab>Yz
Search strings array:
[0] --
[1] ABC -- DEF
[2] GHI -- jkl mno pq
[3] RST -- UV

That's it. I seem to be off by one because that last line...

Line: wx<tab>Yz

never gets added to the array. What I need it to be is:

[0] ABC -- DEF
[1] GHI -- jkl mno pq
[2] RST -- UV
[3] wx -- Yz

What am I doing wrong here?

Thanks.

Opinions please.

I want to share a small model in my iOS app. Now on android I'd do with with ViewModelProviders, but on iOS I'm going with SharedDataContainer which is basically a singleton class that store key value data.

Is there any better approach? Data will not be bigger than 10 list items with guid (key) and int (value)

However; when I have big data I do cache on disk or hello OOM exceptions (or whatever they call that bitch on iOS)

Can anyone help me with this theory about microprocessor, cpu and computers in general?

( I used to love programming when during school days when it was just basic searching/sorting and oop. Even in college , when it advanced to language details , compilers and data structures, i was fine. But subjects like coa and microprocessors, which kind of explains the working of hardware behind the brain that is a computer is so difficult to understand for me 😭😭😭)

How a computer works? All i knew was that when a bulb gets connected to a battery via wires, some metal inside it starts glowing and we see light. No magics involved till now.

Then came the von Neumann architecture which says a computer consists of 4 things : i/o devices, system bus ,memory and cpu. I/0 and memory interact with system bus, which is controlled by cpu . Thus cpu controls everything and that's how computer works.

Wait, what?
Let's take an easy example of calc. i pressed 1+2= on keyboard, it showed me '1+2=' and then '3'. How the hell that hapenned ?

Then some video told me this : every key in your keyboard is connected to a multiplexer which gives a special "code" to the processer regarding the key press.
The "control unit" of cpu commands the ram to store every character until '=' is pressed (which is a kind of interrupt telling the cpu to start processing) . RAM is simply a bunch of storage circuits (which can store some 1s) along with another bunch of circuits which can retrieve these data.

Up till now, the control unit knows that memory has (for eg):
Value 1 stored as 0001 at some address 34A
Value + stored as 11001101 at some address 34B
Value 2 stored as 0010 at some Address 23B

On recieving code for '=' press, the "control unit" commands the "alu" unit of cpu to fectch data from memory , understand it and calculate the result(i e the "fetch, decode and execute" cycle)

Alu fetches the "codes" from the memory, which translates to ADD 34A,23B i.e add the data stored at addresses 34a , 23b. The alu retrieves values present at given addresses, passes them through its adder circuit and puts the result at some new address 21H.

The control unit then fetches this result from new address and via, system busses, sends this new value to display's memory loaded at some memory port 4044.
The display picks it up and instantly shows it.

My problems:
1. Is this all correct? Does this only happens?

2. Please expand this more.
How is this system bus, alu, cpu , working?
What are the registers, accumulators , flip flops in the memory?
What are the machine cycles?
What are instructions cycles , opcodes, instruction codes ?
Where does assembly language comes in?
How does cpu manipulates memory?
This data bus , control bus, what are they?
I have come across so many weird words i dont understand dma, interrupts , memory mapped i/o devices, etc. Somebody please explain.

Ps : am learning about the fucking 8085 microprocessor in class and i can't even relate to basic computer architecture. I had flunked the coa paper which i now realise why, coz its so confusing. :'''(

I hate group project so much.

I yet again successfully stirred up a big drama in my project group. For project, I proposed a CDN cache system for a post only database server. Super simple. I wanted to see what ideas other people come up with. So I said I am not good at the content and the idea is dumb. Oh man, what a horrible mistake. One group member wants to build a chat app with distributed storage. We implemented get/put for a terribly designed key value store and now they want to build a freaking chat app on top of a more stupid kV store using golang standard lib. I don't think any of those fools understand the challenges that comes with the distributed storage.

I sent a video explaining part of crdt. "That's way too complicated. Why are you making everything complicated."

Those fools leave too much details for course stuff's interpretation and says

"course stuff will only grade the project according to the proposal. It's in the project description".

I asked why don't they just take baby steps and just go with their underlying terribly designed kV store.

"Messaging app is more interesting and designing kV store with generic API is just as difficult"

😂 Fucking egos

Then I successfully pissed off all group members with relatively respectful words then pissed off myself and joined another group.

I identified the need for a product akin to an ORM that maps an algebraic type system such as that of Rust to a key-value database (my situation dictates lmdb but I'd like to abstract away the store). Can you recommend prior art for me to research?

Had that moment where I thought to myself I need some sleep.
Working on Android app, using shared preferences (for a lay person, a key value store for settings)
Kept storing data in store and checked repeatedly from different parts of the app for the data. No clue where it went when storing (did store correctly)

Found out I was storing in a store labelled X _Y and was reading from store called XY.

I have to deal with the hardest part of programming: naming things! i fucking hate it, being so incredible uncreative finding a name for a side project..
So heres my idea: I want to build a little cli tool (and probably in the future an app or a web interface) with a rest api on my server for simple storing text snippets. I will be a simple key value store, but my goal is experimenting with new languages and software ;)
I can't imagine a cool name for that thing, do you have an idea? :)