Me: 1 is something, 0 is nothing, NULL is the absence of things
JuniorDev: wut
Me: You've got pizza in a box, that's 1. If there's no pizza in the box, that's 0. If there's no pizza and no box, that's NULL.
JuniorDev: OOH so there's no object to reference if I ask for a slice!
Me: *small tear*

Always explain things in terms of pizza. Always.

Difference between 0 and NULL.

Great news, our company's has a brand new security-first product, with an easy to use API and a beautiful web interface.

It is SQL-injection-enabled, XSS-compatible, logins are optional (if you do not provide a password, you are logged in as admin).

The json-api has custom-date formats, bools are any of "1", "0", 1, 0, false or null (but never true). Numbers are strings or numbers. Utf-8 is not supported. Most of our customers use special characters.

The web interface is using plain bootstrap, and because of XSS it is really easy to customize everything.

How the hell this product got launched is beyond me.

0 and null are two diffferent things DAMMIT!!!!

It's not that I hate PHP, I just hate the lack of consistency in standard function naming and parameter order, nonsensical attribute access, nearly-meaningless comparison operators, reference handling, case (in)sensitivities, and more!

I mean, look at these functions:
strtoupper(...)
bin2hex(...)
strtolower(...)

And look at THESE FUNCTIONS:
array_search($needle, $haystack)
strpos($haystack, $needle)

array_filter($array, $callable)
array_map($callback, $array)
array_walk($array, $callable)

And let me jUST USE SOME ATTRIBUTES:
$object->attr = "No dollar sign...";
Class::$attr = "GOD WHY";

HOW ABOUT SOME COMPARISONS:
(NULL == 0) // true
(NULL < -1) // ALSO true

Functions AREN'T CASE SENSITIVE (at least variables are).

Wanna dereference? TOO BAD, YOU'LL HAVE TO GET OUT THE TNT.

Alright, yeah, I hate PHP.

A QA engineer walks into a bar, and orders a beer.
Then he orders 0 beers.
Then he orders 99999999999 beers.
Then he orders an ahzuzydhu.
Then he orders nothing.
Then he orders -1 beers.
Thrn he orders NULL.
Thrn he orders jzuzuj beers.
Then he orders a "<script>giveMeYourCreditCard()</script>"
Finally, he leaves without paying, comes back and asks for the tab.

Heard this one a while ago and wanted to share it here 🙃

My first poem for programmer girl 😘😘😘

My life is incomplete without you,
You are semicolon of my life

You are my increment operator,
you make my value increases

I am username and you are my password,
without you No one can access me

You are my initializer,
without you my life would point to nothing (NULL or “0”)

If I were a function you must be my parameter,
Because I will always need you

Can you be my private variable?
I want to be only one who can access you

You are my compiler,
My life wouldn’t start without you

You are my loop condition ,
I keep coming back to you

My love to you is like recursive function,
It will never ends & Will never enter into infinite loop

Forever and Ever

Where I work, in our database, we use 3 to indicate true and 7 to indicate false and 0 is true but null is false

In another table, we use 'P' to indicate true and 'I' to indicate false and 'Y' is also false and null is false

And the most used table, we also use 'Y' to indicate yes and 'N' to indicate no, but null is also Yes.

We also store integers as varchar in a live table, but stays an integer in all the other tables. I hope I'm not there when the number of digits exceeds the varchar limit.

These are all live and used in production all created by my boss, the head of IT.

Best part about the covid19 manufactured crisis?
Liquor stores deliver. Worst part about liquor stores delivering? Needing to use their shoddy websites.

I've been using a particular store (Total Wines) since they're cheaper than the rest and have better selection; it's quite literally a large warehouse made to look like a store.

Their website tries really hard to look professional, too, but it's just not. It took me two days to order, and not just from lack of time -- though from working 14 hour days, that's a factor.

Signing up was difficult. Your username is an email address, but you can't use comments because the server 500s, making the ajax call produce a wonderfully ambiguous error message. It also fades the page out like it's waiting on something, but that fade is on top of the error modal too. Similar error with the password field, though I don't remember how I triggered it.

Signing up also requires agreeing to subscribe to their newsletter. it's technically an opt-in, but not opting-in doesn't allow you to proceed. Same with opting-in to receiving a text notification when your order is ready for pickup -- you also opt-in to reciving SMS spam.

Another issue: After signing up, you start to navigate through the paginated product list. Every page change scrolls you to the exact middle of the next page. Not deliberatly; the UI loads first, and the browser gets as close as it can to your previous position -- which was below that as the pagination is at the bottom -- and then the products populate after. But regardless of why, there is no worse place to start because now you must scroll in both directions to view the products. If it stayed at the very bottom, it would at least mean you only need to scroll upwards to look at everything on the page. Minor, but increasingly irritating.

Also, they have like 198 pages of spirits alone because each size is unique entry. A 50ml, 350ml, 500ml, 750ml, 1000ml, and 1750ml bottle of e.g. Tito's vodka isn't one product, it's six. and they're sorted seemingly randomly. I think it's by available stock, looking back.

If you fancy a product, you can click on it for a detail page. Said detail page lists the various sizes in a dropdown, but they're not sorted correctly either, and changing sizes triggers a page reload, which leads to another problem:

if you navigate to more than a few pages within a 10 or so second window, the site accuses you of using browser automation. No captcha here, just a "click me for five seconds" button. However, it (usually) also triggers the check on every other tab you have open after its next nagivation.

That product page also randomly doesn't work. I haven't narrowed it down, but it will randomly decide to start failing, and won't stop failing for hours. It renders the page just fine, then immediately replaces it with a blank page. When it's failing, the only way to interact with the page is a perfectly-timed [esc], which can (and usually does) break all other page functionality, too. Absolutely great when you need to re-add everything from a stale copy of your signed-out cart living in another tab. More on that later. And don't forget to slow down to bypass the "browser automation" check, too!

Oh, and if you're using container tabs, make sure to open new tabs in the SAME container, as any request from the same IP without the login cookie will usually trigger that "browser automation" response, too.

The site also randomly signs you out, but allows you to continue amassing your cart. You'd think this is a good thing until you choose to sign in again... which empties your cart. It's like they don't want to make a sale at all.

The site also randomly forgets your name, replacing it with "null." My screen currently says "Hello, null". Hello, cruft!

It took me two days to order.
Mostly from lack of time, as i've been pulling 14 hour shifts lately trying to get everything done. but the sheer number of bugs certainly wasted most of what little time i had left. Now I definitely need a drink.

But maybe putting up with all of this is worthwhile because of their loyalty program? Apparently if you spend $500, you can take $5 off your next purchase! Yay! 1%! And your points expire! There are three levels; maybe it gets better. Level zero is for everyone; $0 requirement. There are also levels at $500 and $2500. That last one is seriously 5x more than the first paid level. and what does it earn you? A 'free' magazine subscription, 'free' classes (they're usually like $20-$50 iirc), and a 'free' grab bag (a $2.99 value!) twice per month. All for spending $2500. What a steal. It reminds me of Candy Crush's 3-star system where the first two stars are trivial, and the third is usually a difficult stretch goal. But here it's just thinly-veiled manipulation with no benefit.

I can tell they're employing some "smarketing" people with big ideas (read: stolen mistakes), but it's just such a fail.

The whole thing is a fail.

The difference between 0 and null is that 0 is 0 and null is

Oh null, how I detest you.

select birthdate, isnull(birthdate) from Users;
>> [null, 0]

Maybe I wrongfully accuse the abstract concept, and should rather loathe the engineers who can't wrap their heads around null despite their heads being a skull literally wrapping fucking nothingness.

Oracle engineers:
"Wait that's invalid input. What do we do?"
"Default the date to 0000-00-00?"
"That kind of looks like a null..."
"Hmm but it isn't *really* a full-on, butt-clenching, hardcore, intrinsic, I-can-taste-it-in-the-air null"
"Yeah not really feeling it either. It's not giving me the typical null-goosebumps."
"Oh, I know! Let's make it a pretend-null, where the actual type totally depends on the layer of the application!"
"Yeah developers love ambiguous random conversions!"

OMFG I don't even know where to start..
Probably should start with last week (as this is the first time I had to deal with this problem directly)..

Also please note that all packages, procedure/function names, tables etc have fictional names, so every similarity between this story and reality is just a coincidence!!

Here it goes..

Lat week we implemented a new feature for the customer on production, everything was working fine.. After a day or two, the customer notices the audit logs are not complete aka missing user_id or have the wrong user_id inserted.
Hm.. ok.. I check logs (disk + database).. WTF, parameters are being sent in as they should, meaning they are there, so no idea what is with the missing ids.

OK, logs look fine, but I notice user_id have some weird values (I already memorized most frequent users and their ids). So I go check what is happening in the code, as the procedures/functions are called ok.

Wow, boy was I surprised.. many many times..
In the code, we actually check for user in this apps db or in case of using SSO (which we were) in the main db schema..
The user gets returned & logged ok, but that is it. Used only for authentication. When sending stuff to the db to log, old user Id is used, meaning that ofc userid was missing or wrong.

Anyhow, I fix that crap, take care of some other audit logs, so that proper user id was sent in. Test locally, cool. Works. Update customer's test servers. Works. Cool..

I still notice something off.. even though I fixed the audit_dbtable_2, audit_dbtable_1 still doesn't show proper user ids.. This was last week. I left it as is, as I had more urgent tasks waiting for me..

Anyhow, now it came the time for this fuckup to be fixed. Ok, I think to myself I can do this with a bit more hacking, but it leaves the original database and all other apps as is, so they won't break.
I crate another pck for api alone copy the calls, add user_id as param and from that on, I call other standard functions like usual, just leave out the user_id I am now explicitly sending with every call.
Ok this might work.

I prepare package, add user_id param to the calls.. great, time to test this code and my knowledge..

I made changes for api to incude the current user id (+ log it in the disk logs + audit_dbtable_1), test it, and check db..
Disk logs fine, debugging fine (user_id has proper value) but audit_dbtable_1 still userid = 0.

WTF?! I go check the code, where I forgot to include user id.. noup, it's all there. OK, I go check the logging, maybe I fucked up some parameters on db level. Nope, user is there in the friggin description ON THE SAME FUCKING TABLE!!
Just not in the column user_id...

WTF..Ok, cig break to let me think..

I come back and check the original auditing procedure on the db.. It is usually used/called with null as the user id. OK, I have replaced those with actual user ids I sent in the procedures/functions. Recheck every call!! TWICE!! Great.. no fuckups. Let's test it again!
OFC nothing changes, value in the db is still 0. WTF?! HOW!?

So I open the auditing pck, to look the insides of that bloody procedure.. WHAT THE ACTUAL FUCK?!
Instead of logging the p_user_sth_sth that is sent to that procedure, it just inserts the variable declared in the main package..
WHAT THE ACTUAL FUCK?! Did the 'new guy' made changes to this because he couldn't figure out what is wrong?! Nope, not him. I asked the CEO if he knows anything.. Noup.. I checked all customers dbs (different customers).. ALL HAD THIS HARDOCED IN!!! FORM THE FREAKING YEAR 2016!!! O.o

Unfuckin believable.. How did this ever work?!

Looks like at the begining, someone tried to implement this, but gave up mid implementation.. Decided it is enough to log current user id into BLABLA variable on some pck..
Which might have been ok 10+ years ago, but not today, not when you use connection pooling.. FFS!!

So yeah, I found easter eggs from years ago.. Almost went crazy when trying to figure out where I fucked this up. It was such a plan, simple, straight-forward solution to auditing..

If only the original procedure was working as it should.. bloddy hell!!

PHP arrays.

The built-in array is also an hashmap. Actually, it's always a hashmap, but you can append to it without specifying indexes and PHP will use consecutive integers. Its performance characteristics? Who knows. Oh, and only strings, ints and null are valid keys.

What's the iteration order for arrays if you use them as hashmaps (string keys)? Well, they have their internal order. So it's actually an ordered hashmap that's being called an array. And you can produce an array which has only integer keys starting with 0, but with non-sequential internal (iteration) order.

This array weirdness has some non-trivial implications. `json_encode` (serializes argument to JSON) assumes an array corresponds to a JSON array if its keys are consecutive integers in increasing order starting with 0, otherwise the array becomes a JSON object. `array_filter` (filters arrays/hashmaps using callback predicate) preserves keys, so it will punch holes in the int key sequence if non-last items are removed, thus turning arrays into hashmaps and changing your JSON structure if you forget to discard keys before serialization.

You may wonder how JSON deserialization works, then? There's a special class for deserialized JSON objects, `stdClass`. It's basically a hashmap too, but it's an object, not an array, and all functions that would normally accept arrays won't work with it. So basically its only use is JSON (de)serialization. You can even cast arrays to objects, producing `stdClass`.

Bonus PHP trivia:

Many functions return nonsensical values. `preg_match`, the regex matching function, returns 1 for success, 0 for no matches and false for malformed regular expression. PHP supports exceptions, so it could just throw one on errors. It would even make more sense to return true, false and null for these three cases. But no, 1, 0 and false. And actual matches are returned by output arg.

`array_walk_recursive`, a function supposed to recursively apply callback to each element of an array. That's what docs say. It actually applies it to leafs only. It will also silently accept object instead of array and "walk" it, but without recursing into deeper objects.

Runtime type enforcing is supported for function arguments and returned values. You can use scalar types, classes, array, null and a few special keywords. There's also a `mixed` keyword, which is used in docs and means "anything". It's syntactically valid, the parser will accept it, but it matches no values in runtime. Calling such function will always cause a runtime error.

Strings can be indexed with negative integers. Arrays can't.

ReflectionClass::newInstanceWithoutConstructor: "Creates a new class instance without invoking the constructor". This one needs no commentary.

`array_map` is pretty self-explanatory if you call it with a callback and an array. Or if you provide more arrays of equal length via varargs, callback will be called with more arguments, one from each array. Makes sense so far. Now, you can also call `array_map` with null instead of callback. In that case it treats provided arrays as rows of a matrix and returns that matrix, transposed.

Teacher : "0 is nothing, NULL is the absence of nothing."

Wait, what?

Fuck everything about Microsoft Dynamics. I'm supposed to use the REST API to make a web front-end. I notice all of the data comes back codified.

null == 0.
boolean true == 100000000
boolean false == 100000001

except sometimes when

boolean false == 100000000
boolean true == 100000001

or other times

string "Yes" == 100000000
string "No" == 100000001
string "Maybe" == 100000003

Hang on. Is the system representing a 1 bit value with base 10 numbers? Did the client set this up like this? Holy crap every number corresponds to a unique record in a table somewhere. That means it only returns numeric values instead of strings and I have to figure out what the number means in the context of the table.

A "key" is user typed? So every time someone starts to make a new record it saves a new "key" without a record? So I can pull a bunch of "0" records if I pull sequentially? So basically I need to see all of the data in Dynamics to have any context at all for what is returned from the Dynamics API? Fuuuuuuuuuu

Just started a new job three weeks ago. I was doing pair programming with another developer that has been there two years; I was assigned an issue and wanted his opinion on it. He implemented a fix that involved multiple complex if statements.

He was surprised after I went ahead and showed him that the variable in question could be used (it was either 0, null, or > 0) like a boolean. I brought it down to 3 lines; a single if statement. Felt like a boss.

endor's first magical adventures with PostgreSQL

"Alright, got the docker image up and running, and I'm connected to the db, both from console and from Datagrip! Cool, let's get started with the tutorial!"
*cue montage of me using Datagrip to create my first schema, then the first table, then insert a bunch of data to try things out*

"Cool, now let's see if I can view my data from the console"
db1-# select * from my_schema.table1
db1-# [nothing]

"*Ahem*, I said:"
db1-# select * from my_schema.table1
db1-# [nothing]

db1-# select * from my_schema.table1
db1-# [cricket noises]

"Wut, why can't I see the data that I inserted? Wtf is going on?"

*30 minutes later*
"Alright, I have no idea what's going on, so let's try inserting the data from console and see if Datagrip can see it"

db1-# insert into my_schema.table1(id, name, field2, field3) values (1, 'Mike', null, 123), (2, 'Jake', 0, 456);
ERROR: syntax error at or near "SELECT"
LINE 2: SELECT
^

"Wait, what?"

db1-# insert into my_schema.table1(id, name, field2, field3) values (1, 'Mike', null, 123), (2, 'Jake', 0, 456);
INSERT 0 2

"Wtf? Haaang on... "

db1-# select * from my_schema.table1;
id | name | field2 | field3
----+------+--------+--------
1 | Mike | | 123
2 | Jake | 0 | 456
1 | Mike | | 123
2 | Jake | 0 | 456
(4 rows)

*eye twitches*

How to write a proper Hello World program in Java:

public class ProperJavaProgram {
    public static void main(String[] args) {
        try {
            // Write the hello world file
            List<String> lines = Arrays.asList(
                    "#include <stdio.h>",
                    "int main() {",
                    "printf(\"Hello World!\\n\");",
                    "return 0;",
                    "}"
            );
            Path file = Paths.get("awesome-program.c");
            Files.write(file, lines, Charset.forName("UTF-8"));

            // Execute the file
            executeCommand("cc awesome-c-program.c -o awesome-executable");
            executeCommand("./awesome-executable");
        } catch (IOException e) {
            System.out.println("You're screwed, just use Java and get over it. " + e);
        }
    }

    public static void executeCommand(String command) {
        try {
            Process p = Runtime.getRuntime().exec(command); // Run the process
            BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream())); // Get the output
            String s; // Print out the output
            while ((s = stdInput.readLine()) != null) {
                System.out.println(s);
            }
        } catch (IOException e) {
            System.out.println("You're screwed, just use Java and get over it. " + e); // UR SCREWED
        }
    }
}

You know that feel as a developer when you add a feature to someone's existing project and you see a shitty code. well this has to be one of the shittiest code I have seen.

select_patient:function(patient)
{
console.log(patient)
this.select_patient_index = 0;
var pending = patient.Pending;
var USER_ID_Patient = patient.ID;
var prescription_ID = patient.Prescription_ID;
if(prescription_ID == null) prescription_ID = 0;
patient.Pending = pending = parseInt(pending);
patient.Prescription_ID = prescription_ID = parseInt(prescription_ID);
patient.USER_ID_Patient = USER_ID_Patient = parseInt(USER_ID_Patient);

if(pending > 0 && prescription_ID > 0)
{
this.select_patient_index = this.list.indexOf(patient);
$('#patientContinueModal').modal('show');
return false;
}

$scope.prescription.set(patient,null);
return false;
}

Also the guy has a space in his url.
xxxxxx.com/shopping cart !

My first instinct is to poke my eyes, find the developer (if we can call him that and shove it up his ______)

Working on an Android app for a client who has a dev team that is developing a web app in with ember js / rails. These folks are "in charge" of the endpoints our app needs to function. Now as a native developer, I'm not a hater of a web apps way of doing things but with this particular app their dev teams seems to think that all programming languages can parse json as dynamically as javascript...

Exhibit A:

- Sample Endpoint Documentation
* GetImportantInfo
* Params: $id // id of info to get details of
* Endpoint: get-info/$id
* Method: GET
* Entity Return {SampleInfoModel}

- Example API calls in desktop REST client
* get-info/1
- response
{
"a" : 0,
"b" : false,
"c" : null
}
* get-info/2
- response
{
"a" : [null, "random date stamp"],
"b" : 3.14,
"c" : {
"z" : false,
"y" : 0.5
}
}
* get-info/3
- response
{
"a" : "false" // yes as a string
"b" : "yellow"
"c" : 1.75
}

Look, I get that js and ruby have dynamic types and a string can become a float can become a Boolean can become a cat can become an anvil. But that mess is very difficult to parse and make sense of in a stack that relies on static types.

After writing a million switch statements with cases like "is Float" or "is String" from kotlin's Any type // alias for java.Object, I throw my hands in the air and tell my boss we need to get on the phone with these folks. He agrees and we schedules a day that their main developer can come to our shop to "show us the ropes".

So the day comes and this guy shows up with his mac book pro and skinny jeans. We begin showing him the different data types coming back and explain how its bad for performance and can lead to bugs in the future if the model structure changes between different call params. He matter of factually has an epiphany and exclaims "OHHHHHH! I got you covered dawg!" and begins click clacking on his laptop to make sense of it all. We decide not to disturb him any more so he can keep working.

3 hours goes by...

He burst out of our conference room shouting "I am the greatest coder in the world! There's no problem I can't solve! Test it now!"

Weary, we begin testing the endpoints in our REST clients....

His magic fix, every single response is a quoted string of json:

example:
- old response
{
"foo" : "bar"
}
- new "improved" response
"{ \"foo\" : \"bar\" }"

smh....

Below is a transcript from work Slack today. Only the names and some code are changed. It ended up causing a bit of drama. DevRanters, what do you take from this?

---

Delivery Lead:
Hey Gang. What's the blocker for FEATURE-123?

Dev1:
FEATURE-122 crashed on iOS app when viewing Feature Introduction page.

Teach Lead:
I've talked about this with Dev1 on a side channel.
And diagnosed the stack trace.
It looks like there is/was some bad handling of a List in the Feature Introduction view logic.
But this is confined to changes that Dev2 is still working on.
(It's not present in master)
Dev2, what's your current position on this?

Dev2:
I have tested at my end with Dev1 but it seems to be working fine

Tech Lead:
There is a race condition related to the use of someList.first()
My guess is that theres a Flow of those lists defined, with an initial value of emptyList
And that on your machine, that Flow is updating with a new value quickly enough that it doesn't matter.
But on Dev1's, for whatever reason, it doesn't get there in time, hits the empty list and falls over.
The logic that's performing the first() needs to gracefully handle empty lists as well.

Dev2:
Where is that logic called?

Tech Lead:
Here's the stack trace Dev1 provided in our conversation earlier:
Caused by: kotlin.NoSuchElementException: List is empty.
...
at 3 iosApp 0x00000000 kfun:kotlin.NoSuchElementException#<init>(kotlin.String?){} + 00
at 4 iosApp 0x0000000 kfun:kotlin.collections#first@kotlin.collections.List<0:0>(){0§<kotlin.Any?>}0:0 + 000
...
at 9 iosApp 0x0000000 kfun:kotlin.coroutines.native.internal.BaseContinuationImpl#resumeWith(kotlin.Result<kotlin.Any?>){} + 0000

This line:
kfun:kotlin.collections#first@kotlin.collections.List<0:0>()
...says that it's first() being called on an empty list.

Dev1:
FYI: Dev3/Dev4/myself are seeing the same issue with the same stack-trace above.

Tech Lead:
So Dev2, have you introduced such a call?
Because I checked master branch and there isn't one, in that version of the file.
Ok, I'll check your working branch Dev2
...
Yes you have here:
var processed1 = someList.first()
var processed2 = someList.first()
...
Lines 123, 124.
Solution looks really straightforward guys.

Dev2:
Okay, I will fix that and push the change

Tech Lead:
Check if someList is empty and allow for generating / handling null processedValues in the view.

Now; I'm going to be straight with you here.
This issue has been discussed over several hours today.
I expect that either one of you could have gone through the process I did in the last 10 minutes above, and resolved it in the same way :point_up:

Dev2:
I went on a break and it's not reproducible on my machine

Tech Lead:
I didn't reproduce it on mine either.

Dev1:
Dev2 and myself are now on sharing screen to sort this issue out. Hope to update back later.

Tech Lead:
<Screen shot of diff with changed code>
:point_up: That change should do it.

Dev2:
Already have pushed the change.

Tech Lead:
...just seen it, is good - same approach :ok_hand:
Dev1 please let us know when tested on your machine.

Dev1:
That does it. It fixes the issues. Thank you, Dev2. I will pick it off from here.

Tech Lead:
Glad to hear it guys.

Dev1:
I have to say this that it is not because we are not working on the issue - Dev2 and myself (together with Dev3/Dev4) have been on this issue all this morning. It just difficult to connect the dot when it wasn't reproducable on Dev2's machine. I brought the issue up because I wanted to switch to working on other tickets while waiting for this to resolve. Still thank you largely for Dev2's work and your keen eyes that spot and resolve the issue quickly.

Tech Lead:
Noted Dev1.
I think the take-away has to be to read the stack-trace carefully... don't worry - we've all been guilty of not reading the error in full, at some point.
The stack trace said that the 'first' element is being referenced from an empty list - that's just logically impossible, right?
Looking for that call to first, we saw it wasn't in the code before, and is after (two of them, in fact).
So then we ask ourselves, how can we deal with an empty list - and then solution almost presents itself.
It didn't really take reproduction of the error to resolve.
Maybe working with a new tech stack creates an anxiety that every issue faced will have a complex solution related to that stack; but I think you'll agree, this particular issue really just required a deep breath and your trusty 'debugging skills 101'... don't lose them! :smiling_face:

How to spend more time writing docs then code?
15m = doc
1m = code

<code>
/* Motor DC + Mosfet IRF520 + Servo
Materials:
IRF520 (Mosfet) + Dc motor + Batery (3V min)
diode (1N4007?)
Changed Tip122 for IRF520: Tip122 has less resistance and produces more heat

Hardware:
ARDUINO = A(port , 5V , GND)
MOSFET = M(A[port] , + , GND)
MOTOR = MOTOR(+ , -)
BATERIA = BAT(+ , -)
DIODO = D(sinal_1 , sinal_2)

MOSFET
M(port) = A(port)
M(+) = D(sinal_1) AND MOTOR(+)
M(GND) = A(GND)

D(sinal_2) = B(+) AND MOTOR(-)

ARDUINO
A(port) = M(port)
5V = null
A(GND) = M(GND) AND BAT(-)

*/

#define motorPIN 8 // A(port)
int loopy = 0; // Loop variable to limit de program

void setup()
{
// Initialize the motor pin as an output:
pinMode(motorPIN, OUTPUT);

}

void loop() // 1 loop == 100ms
{
if (loopy < 10) // Turns motor ON for 1 second
{
digitalWrite(motorPIN, HIGH);
}
else // Turns motor OFF
{
digitalWrite(motorPIN, LOW);
}
}

</code>

0 and null

I'm working as an intern in a company and i have another intern that i must supervise (it like internception) .here is my daily nightmare :
- To start this intern never google something she copy paste from my code and if she got an error she send me a screenshot . Once the error message clearly said "cannot call function from array" and even that she didn't know what's the problem (she was supposed to it on array items)
-Before we started working together she spent a week complaining that a sending email function didn't work for her so the manager called me to check what's her problem. She had an antivirus that blocked request via ssl port.all i had done is open the log file and read the errors.
- She had a function should iterate over an array and for each item check a condition this is a part of what she wrote :
For ($i=0;count($categories);$i++){
if ($getrelativepath=null)
{
....etc other​ stuff she copy pasted.
Ps: the name of the function that she must call on array items is getRelativePath

- she wrote once
$response=array();
for (...){
array_push($response,$data[$i]);
return $response;}
She thought the function can iterate and return response at the same time.
- we are working on a website and she told me she doesn't know how to code Javascript and jquery (she think it's a language) and she never knew what ajax is.
- without mentioning the hundreds of empty spaces and multiple empty divs in html .
This year she'll become a computer science engineer .

They tell me to only review security in the security reviews I'm doing (and if I bring to attention that they're implementing a weak encryption so even though they're not using it at the moment it might cause issues so be careful with that they say to only review security 😵) and then I see this mssql in a where:
AND ISNULL(field, 0) IS NULL
And I think wtf, should I report that? I did and it's a bug and they're thanking me now....
God dammit it's hard to "review security" here...

C# is getting so fucking obfuscated with these null check inceptions. Found the following in my company's code base. Why did it take me and 3 other devs an hour to figure out how to write this if statement into a flowchart?

if(!string.IsNullOrEmpty(a?.Id ?? b[0]?.Id))...😫😫😫

FYI: We figured it and also found some bugs with logic, but can you? I'll post our flowchart if ranters are interested.

So to add to the madness:
if(!string.IsNullOrEmpty(a?.Id ?? (b?.Any() ? b[0].Id : null)))...🤯🤯🤯

>Working on code
>Shit works as intended first try, nice
>Goes to play strange bootleg Gameboy Color ROM sent by a friend
>ROM immediately fucking dies
wtf.svg
>Pop emulator's debugger
we're executing from VRAM, stack's firmly embedded in ROM
>why
>Add execution breakpoint to entrypoint of game, restart emulated system (because i'm actually using the legit bios i hacked so it allows null/corrupted games to run)
>Step through everything, everything goes well until all of a sudden we call a function and shit hits the goddamn fan
well we have the culprit
>step through subroutine
if <unused_byte_in_HRAM> != 0 then stackPointer+=32;tryAgain();else return
>***y***
>Realize this is using a bootleg Memory Bank Controller with hard-backed encryption so none of the bytes executed or read as data are the right byte
>Find emulator that'll handle the jank MBC
>read code to try and figure out how it works
if checksumExtendedLogoBlob == some_number then set MBC_Bootleg1 else if checksumExtendedLogoBlob == some_other_number then set MBC_Bootleg2 else if...
>of course
>Spend 10 minutes finding the right bootleg MBC
>code shows 8 possible tables for real bit order based on some value in the cart header
>look for code that gets this value
>not in the header
>not in ANY header in this 1000+ file emulator
>not in any related cpp files???
>get desperate
>email author
>"Delivery failed: email doesn't exist"

fuck me i guess

It's high time people start understanding the difference between 0 and NULL. A zero is a numerical 0 and null is just .

NULL and '/0' are two different things. NULL is a null pointer. '/0' is a null byte. C handles those two differently enough to introduce some interesting issues. Helped a friend debug his code, execvp() was freaking out because he had tried to terminate his argv array with a null byte instead of a null pointer. As far as the system was concerned, that doesn't mean anything more than "oh look there's no string here." Big big difference.

Every once in a while the flexibility of dynamic types comes back and bites you in the ars:

So I created method that returns the date significance (day, month, year) or null when no date is set.
I chose a class constant DAY with the value 0.
This is not a problem in if statements as I always use === but in this case a switch made more sense. And as you can guess no date set (NULL) was handled in the self::DAY (0) case... 😐😑😶 Silently resulting in wrong results when no date is given! #£#@$& (and other comic swearing symbols)

Even though php7 finally has decent type hinting resulting in much clearer defined API's we can still go very wrong.
More love to Go for less verbose static typing! To bad we can rarely use it at the office 😥

What the fuck is going on ???

How the "intermediate" c# developers can't do a simple null safe average of even numbers in an array ?!

Why they still write loops and shit (without any nul checks ofc) while it can be done in 1 line :

array?.Where(x => x % 2 == 0).DefaultIfEmpty(0).Average() ?? 0

WHY ? Even Junior c# dev is supposed to know that shit

null >= 0 and null <= 0 but null !== 0 neither it is > 0 nor < 0

Guess the language

#fml

It's high time people start understanding the difference between 0 (zero) and NULL.

Zero: You visiting the toilet and notice the exhausted toilet paper roll.

NULL: You visiting the toilet and notice that there's no toilet paper roll.

Get the difference?

The bug: Some string values for an identifier property in the data objects are being sent from our frontend prefixed with a '0'. Sometimes. When it happens, it usually gets stripped away again by the time it's passed to our backend. But not always.

This 0 is never explicitly set anywhere. I even searched for a few variants of " = 0" in both the frontend and backend projects without receiving any results. You might already be suspecting where this is going.

So it turns out.

The data object which holds this value is being initialized in the aspnet (don't ask) backend and passed to the frontend, which then hydrates it. This value is always an integer number, albeit incidentally so which is why string is used as the actual type. When this object is initialized, it's hardcoded with an anonymous type where this property is set as int because I guess someone figured "it's always an int though". Being a typed language, primitive scalars can't be null objects which means the property's value becomes the concrete int 0.

Okay weird. I can think of better ways of doing this but let's just set it to string as I can't start overhauling things right now. Let's just go find where this value is somehow concatenated into the incoming parameter.

You see, this happens because at the point where the frontend sets this value, it may be an int or string depending on where it came from, and I guess someone figured that in order to cast it to string you just go prop += arg seeing as the prop is empty string and all. Because explicitly casting it or - as much as I get a rash whenever I see it - going prop = "" + arg would be too verbose and unoriginal.

Bonus round: How come the 0 only sometimes made it all the way to our backend? The thing is that this bug has been fixed before. The fix is that because this string is "always" an int, you can parse it to int before passing it to the backend in case it has leading zeroes. This path is only taken in certain views because someone forgot to copypaste their fix into all the places this is repeated.

Sometimes you find a bug and you are just somehow more grumpy after fixing it.

Pushed some changes to PROD today. Go to login and check changes .. noooooope!

Still a bit new to Symfony 5... but I'm just not a fan right now. The login screen just jumps back to itself. No login failed message and prod log had a size of 0 so that was no help.

Traced this thing way down into the CSRF Authentication functions. \is_callable(...namespace) just returning null so no go on getting a token for isTokenValid() =/
ugh! This is truly the most torturous junk I've ever seen. Nothing in the logs so I decided to just use the good old ECHO'HERE' debugger.

What was the issue you might ask?... effin' yaml file
Fix for now is to set the session handler_id back to null

It's so frustrating to explain rxjs pitfalls to the manager.

To avoid the diamond problems and glitches caused by combineLatest and debounceTime(0), I decided to use single stream with nested reactivity.

Then the manager asked me to use withLatestFrom instead of combineLatest.

Sure withLatestFrom makes sense to the original author, when the original author is able to remember the reactive graph and put proper dependencies to combineLasted/withLatestFrom accordingly, but anyone else who touches the component later needs to retrace the reactive graph to avoid the glitch. Sometimes it's just impossible when many dependencies are derived from combineLatest+debounceTime(0). When no one is trained to code reactively, I don't expect people to know where to put a dependency. After many trials and errors, the only way to avoid the diamond problem is to use nested reactivity where child streams are created within root stream each time root stream emits.

The mentioned manager put all sorts of side effects in observable chains. The manager keeps saying the stream is too large when their subscription functions (sometimes nested) are way worse with litered mutations everywhere. Anything in observable can be traced by go to definition but tracing side effects usually requires global searches.

Recently, he put startWith to the end of a synced stream to fix a bug where button would collapse when there is no content (initial null emission). Rather than fixing the default height, he thinks using startWith(defaultLabel) is a good idea. Of course, he doesn't know that a synced stream should only emit 1 value on new subscription and that extra emitted value will cause rxjs glich down the pipe.

I hate corporate jobs

//not a rant
Ok so weird bug. Fellow C# people, help me out.

//already made it work so no I don't need to post it on SO

I write a Switch Case block based on the user's combo-box selection id.
if id 0, add everything to the mainpage grid
if 1, a foreach loop filtering out the ones with a certain attribute of the object as false and adding em to the grid on the mainpage
if 2, similar scenario as 1.
Countless times I had a null exception with the "count" variable being the number of items in the post which, wasn't null. there was no other variable that was being initialized from within the block, so I had no idea what was causing it.
Moving to an if-else statement doing the same thing, same issue.
In the end I created 2 empty lists before the switch case and filled them up and then another loop filling the mainpage grid with the now-filled list.
In the end im doing the same thing, with no issues, but I don't understand why adding it directly caused an error, what was null?
I wanna understand the working that might be causing this.. if anyone else came across this, would be glad to hear from you

Function in my Dao file is:

@Query("SELECT * from appData WHERE type = :type ORDER BY id DESC")
fun getData(type: String): Flow<List<AppData>>
The database contains a column of automatically generated int primary key 'id', a column of string named 'type', and another string column named 'content'.

A Part of code from my composable function is:

val currentRetrievedDate: Date = Date()
val currentDate: String = SimpleDateFormat("dd-MM-yyyy").format(currentRetrievedDate)

var lastDateObjectList by remember { mutableStateOf(emptyList<AppData>()) }

LaunchedEffect(streakCounterViewModel) {
coroutineScope {
streakCounterViewModel.appDataRepository.getDataStream("lastDate")
.collect { newDataList ->
lastDateObjectList = newDataList as List<AppData>
}
}
}

if (lastDateObjectList.size>1){/*TODO*/
for (i in 1 until lastDateObjectList.size){
LaunchedEffect (Unit){
streakCounterViewModel.deleteData(id = lastDateObjectList[i]!!.id,
type = lastDateObjectList[i]!!.type,
content = lastDateObjectList[i]!!.content)
}
}
}

val lastDateObject: AppData?/* = lastDateObjectList[0] ?: null*/
lastDateObject = if (lastDateObjectList.isNotEmpty())
lastDateObjectList[0]
else null

var lastDate = lastDateObject?.content ?: "00-00-0000"

var currentStreakObjectList by remember { mutableStateOf(emptyList<AppData>()) }

LaunchedEffect(streakCounterViewModel) {
coroutineScope {
streakCounterViewModel.appDataRepository.getDataStream("currentStreak")
.collect { newDataList ->
currentStreakObjectList = newDataList as List<AppData>
}
}
}

if (currentStreakObjectList.size>1){
for (i in 1 until currentStreakObjectList.size){
LaunchedEffect (Unit){
streakCounterViewModel.deleteData(id = currentStreakObjectList[i]!!.id,
type = currentStreakObjectList[i]!!.type,
content = currentStreakObjectList[i]!!.content)
}
}
}

val currentStreakObject: AppData?/* = currentStreakObjectList[0] ?: null*/
currentStreakObject = if (currentStreakObjectList.isNotEmpty())
currentStreakObjectList[0]
else null

var currentStreak = currentStreakObject?.content ?: "0"
In this code, the last login time and last streak of user is already saved, we just have to fetch the data from the local database, make sure that there are not more than 1 occurrences of same data type in the database, and then use that data. But this, instead of using the database values, uses 00-00-0000 as the lastDate, and uses "0" as the currentStreak (which should only be used for the first not, and in some rare situations only), and is not able to retrieve data from the database properly.

The data saving and updating logic is working fine, but only the retrieval part is causing some issue.

The complete project is also uploaded on github: at HealthEase repo of tauqirnizami