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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
83%
+8 −0
Which functions in the C standard library must always be avoided?

It would seem that the C standard library is a collection of diverse functions that pretty much just ended up in the standard by tradition or "accident", rather than through some careful plan or ra...

1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 2y ago by Lundin‭

66%
+2 −0
How do I get an animation from another source playing through hovering?

I was tasked with an assignment where I should get a box to move to the 4 corners of the viewport by hovering on a button. Most of the code is already finished except for figuring out how to get th...

0 answers  ·  posted 2y ago by General Sebast1an‭  ·  edited 2y ago by General Sebast1an‭

22%
+0 −5
Ignore code paths

I try to ignore paths in the Codeql code scanning file. But every scan it seems that scanning doesn't ignore these files, do you have any tips?

0 answers  ·  posted 2y ago by fadi‭  ·  edited 2y ago by Alexei‭

70%
+5 −1
What does a variable followed by parentheses ("ptr()") mean?

What does ptr() mean in this code? #include<stdio.h> #include<stdlib.h> void PrintHello() { printf("Hello\n"); } int Add(int a, int b) { return a+b; } int main...

2 answers  ·  posted 2y ago by dumplings‭  ·  last activity 2y ago by Martin Bonner‭

75%
+4 −0
WPF MVVM ListBox not updating

I am trying to combine MVVM in WPF using Microsoft.Toolkit.MVVM. Somethings are working as expected. The text boxes bind to fields and update in both directions. The button command executes and cha...

2 answers  ·  posted 2y ago by FrankLuke‭  ·  last activity 2y ago by elgonzo‭

40%
+0 −1
How To Verify Old Password in PHP? [closed]

I have a page to change the user password in my website, this page can only be used if the user have a logged in! The change password page have 3 inputs: Old Password, New Password and Con...

0 answers  ·  posted 2y ago by rrenildopereiraa‭  ·  closed 2y ago by Alexei‭

50%
+0 −0
How to get rid of HTML tags and convert entities in SQL Server?

I have to migrate a bunch of text from an old application into a new one. Some of these texts contain HTML tags and entities (HTML editor was used) and now they do not want to support this in the n...

2 answers  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by gbjbaanb‭

28%
+0 −3
C++ exit code -1073740940 [closed]

What means the exit code -1073740940 in C++?

2 answers  ·  posted 2y ago by always_improve‭  ·  closed 2y ago by Alexei‭

75%
+7 −1
How to avoid "exception is never thrown" when commenting out a line while debugging

I have a code block like this: try { ... x.foo(); // This is the line that forces us to have the try block ... } catch (ArrayIndexOutOfBoundsException e) { logger.error(e.getM...

1 answer  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by anatolyg‭

60%
+1 −0
Tackling net::ERR_NAME_NOT_RESOLVED and timeout error on browser object creation when using Puppeteer

Used to work with PhantomJS. Want to upgrade to Puppeteer. Started with some code: "use strict"; const puppeteer = require("puppeteer"); const capture = async () => { let browser; try {...

0 answers  ·  posted 2y ago by sbirl‭  ·  edited 2y ago by Alexei‭

71%
+3 −0
Why does pushing to one array affect all the arrays in my two-dimensional array?

I was trying to initialize a simple two dimensional array as follows: const arrays = Array(3).fill([]); However, when I tried to push an entry into one of the arrays, it seems like it gets push...

1 answer  ·  posted 2y ago by Moshi‭  ·  last activity 2y ago by Moshi‭

57%
+2 −1
How can the Caesar cipher be implemented in Java?

The Caesar cipher is a substitution cipher in which the letters of an ordered alphabet are cyclically shifted by a given number. A detailed description can be found e.g. here. Let u be the index o...

2 answers  ·  posted 2y ago by Holden‭  ·  last activity 2y ago by hkotsubo‭

37%
+1 −3
Mocking methods with arguments

Let's say I have this class I want to mock class A { public void add(T arg) { B b = A.getB(); U val = somefunc(arg); V ret = b.add(val); } } I have a spy o...

3 answers  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by klutt‭

40%
+2 −4
unable to create databases in Ruby

I had installed Ruby. rvm install 2.6.6 I had Ruby which version was 3.0.0. I had removed it. Then, installed 2.6.6. When I try bundle install I got no error. When I tried following command...

0 answers  ·  posted 3y ago by deleted user  ·  edited 2y ago by Alexei‭

71%
+3 −0
Algorithmically generating the grid formed by the vertices of a dodecahedron (Hunt The Wumpus)

I am attempting to write a program to simulate Hunt The Wumpus in the K programming language. The game requires a grid that is created by the vertices of a Dodecahedron, which is cyclic and triangu...

2 answers  ·  posted 2y ago by Razetime‭  ·  edited 2y ago by Razetime‭

62%
+3 −1
Comparing two excel files with Python based on changes

I have two tables: Table1: Name Description Amount 123 Description123 123 456 Description456 456 789 Description789 666 101 Description777 101 133 De...

1 answer  ·  posted 2y ago by sfrow‭  ·  last activity 2y ago by ibmx‭

62%
+3 −1
How do I strip file extensions from URLs with H2O?

I'm trying to use H2O to serve a multi-file PHP website without routing—just having a separate PHP file for every page. The relevant part of my H2O config currently looks like this: paths: "/":...

1 answer  ·  posted 2y ago by Ullallulloo‭  ·  last activity 2y ago by jminer‭

71%
+3 −0
Conditions which always matches returns no result with CTE

I have the following scenario (in MySQL 8): CREATE TABLE `steps` ( `id` int NOT NULL AUTO_INCREMENT, `number` varchar(30) DEFAULT NULL, `parent_number` varchar(30) DEFAULT NULL, `timestamp` ti...

1 answer  ·  posted 2y ago by artaxerxe‭  ·  edited 2y ago by Alexei‭

42%
+1 −2
How to create an object, call one of it's methods and pass it as an argument as a oneliner?

Assume I have this class Foo class Foo { private int x; void setX(int x) { this.x = x; } } And I have a Junit test like this: Bar bar; @BeforeEach void setu...

3 answers  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by Alexei‭

62%
+3 −1
DST disrupting rsync twice a year

I'm facing rsync full syncs every once upon a time, I think it's because DST, notice an hour of difference: $ ls -l tier2/VIDEO-2020-06-17-15-10-27.mp4 /Volumes/KINSTON2/dat/laptop_kinstones/tier2...

1 answer  ·  posted 3y ago by .                                                .‭  ·  last activity 2y ago by .                                                .‭

72%
+6 −1
How to unittest method that involves contacting remote servers?

Let's say I have this class: class myService { private boolean foo(T arg) { return arg == 42; } public Response bar(U arg) { if(foo(U.field)) { return Response.st...

1 answer  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by meriton‭

66%
+2 −0
How to check if a ldap username is valid without contacting the active directory via ldap?

I have some code connecting to an active directory via ldap. Something like this: public Response add(User user) { try { LDAPConnectionPool ldapPool = ldapConnectionPool.getPool();...

0 answers  ·  posted 2y ago by klutt‭  ·  edited 2y ago by klutt‭

40%
+2 −4
How do I properly format a String for parsing with a com.google.gson.JsonParser

I am trying to check a JSON array for a certain element. However, when I try to instantiate a JsonElement to search the list for: JsonElement builderElement = JsonParser.parseString( "{\"disc...

0 answers  ·  posted 2y ago by cuzzo‭  ·  edited 2y ago by Stephen C‭

66%
+2 −0
Difference between puts and print for Array

I have an array friends = Array.new friends[0] = "Mad man" friends[1] = "hey" There's two ways to print it (using print or puts). At first I tried print print friends which gave: ["Mad...

1 answer  ·  posted 3y ago by deleted user  ·  edited 2y ago by Trilarion‭

71%
+3 −0
How to allow sign-ups without confirmation as an exception using devise confirmable?

I use the devise authentication gem for a Rails application and it's very convenient. Typically I want my users to confirm their registration by email. Therefore the User model looks like class U...

1 answer  ·  posted 2y ago by Trilarion‭  ·  last activity 2y ago by ArtOfCode‭

80%
+6 −0
Continuously read from piped input using Vim

In Vim, it's possible to tell it to read from stdin instead of a file, by using vim -. This is so that you can pipe the output of one command into Vim, to view/edit it there. The problem I'm facin...

2 answers  ·  posted 2y ago by Hyperlynx‭  ·  last activity 2y ago by deleted user

77%
+5 −0
noreturn function with non-void return type

Is it legal ISO C to declare a function as noreturn with a non-void return type (but of course not actually returning)? As far as I can read from the standard, it seems legal. Example: noreturn ...

1 answer  ·  posted 2y ago by alx‭  ·  edited 2y ago by alx‭

80%
+6 −0
Is it OK to use scanf with a void pointer?

I've created a function that calls scanf passing a void pointer as argument: void read(const char *format, void *p) { scanf(format, p); } And tested it with different types: int n; read...

2 answers  ·  posted 2y ago by hkotsubo‭  ·  last activity 2y ago by Lundin‭

80%
+6 −0
When does it not work to dereference the pointer for sizeof during malloc?

Background This is kind of a subquestion to How to properly use malloc? When allocating, there are basically two common ways of using the sizeof operator: int *p; p = malloc(n * sizeof *p); /...

1 answer  ·  posted 2y ago by klutt‭  ·  edited 2y ago by hkotsubo‭

77%
+5 −0
Is an ORDER BY required when looping through MySQL records with LIMIT?

Let's say I have a table with 10,000 rows and instead of selecting all of the rows at once I select 1,000 at a time like LIMIT 0,1000 LIMIT 1000,1000 etc. Without an ORDER BY statement the or...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 2y ago by Alexei‭

66%
+2 −0
Why is my last input box not centering (class: powerwall-battery-input)?

I found a form I wanted to duplicate on a roof construction website. All my input boxes are centered except the last one that's a bit off and I cannot figure out why. Here is my code: HTML <...

1 answer  ·  posted 2y ago by WannaBeAWebDev‭  ·  last activity 2y ago by meriton‭

71%
+3 −0
Detecting if a user has stopped interacting with a web view for a certain time

I am interested in finding out all the aspects I need to cover in order to correctly assess if a user has stopped interacting with a web page. So far, I found the following: Idle Detection API -...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by meriton‭

80%
+6 −0
Are static pointers implicitly initialized to NULL?

Consider this code: #include <stdio.h> int main(void) { static void *ptr; if(ptr == NULL) puts("It's NULL!"); } I wonder if this is guaranteed to print "It's NULL!" I know ...

1 answer  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by Lundin‭

77%
+5 −0
How to prevent token from being refreshed

I have an Angular application. The frontend has a mechanism that periodically fetches some information like this: ngOnInit(): void { setInterval( () => { this.http.get(... ).sub...

1 answer  ·  posted 2y ago by klutt‭  ·  last activity 2y ago by meriton‭

60%
+1 −0
Preloading some data at application startup as fast as possible

I am caching some very static information (changes once per day) in my ASP.NET Core application. This is normally done when needed ("lazy"). One such cache item is a 50K list of items that are tak...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Alexei‭

66%
+2 −0
What are the drawbacks of using data snapshot testing?

Our team is finally focusing on writing more automatic testing and one of my ex-colleagues recommended to try out the Verify library. The tool does the following: runs the test and compares the...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

66%
+2 −0
How to write database friendly code when using an ORM?

There are a lot of articles and presentations that show little love for ORMs. This is mainly because some queries are so complex and heavy on the database that they lead to significant issues in p...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Alexei‭

50%
+2 −2
Alternative to Google Adsense [closed]

I'm starting a small site with some online tools. Tried to include Google Adsense but I initially got rejected because the site was still on construction. Yet I've seen in the forums that they are...

0 answers  ·  posted 2y ago by nelson777‭  ·  closed 2y ago by Alexei‭

71%
+3 −0
Why static code analyzers such as SonarQube indicate a high code complexity for switch statements?

During a presentation of a pipeline configuration, a colleague showed a SonarQube integration and one of its reports. A warning was caused by overrunning the max value for the code complexity thres...

2 answers  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

50%
+0 −0
Migrating HTML strings to a more secure alternative

Our team will have to migrate an old application to use a new tech stack. One of the features involves the usage of HTML editors which serialized the content as HTML and I am able to see valid HTML...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by r~~‭

37%
+1 −3
Cannot write multipart message to byte array [closed]

I'm trying to write a MIME message to the console. ByteArrayOutputStream out = new ByteArrayOutputStream(); MimeMultipart replyMsg = mdnCreator.createMDNData(); replyMsg.writeTo(out); out.close...

0 answers  ·  posted 2y ago by artaxerxe‭  ·  closed 2y ago by Alexei‭

77%
+5 −0
bootstrap : how to align text with a button inside a grid

I have this bootstrap code (grid) <div class="container p-3 center"> <div class="row"> <div class="bg-light border-bottom border-secondary border-top col-6 te...

0 answers  ·  posted 2y ago by meneguzzo68‭  ·  edited 2y ago by Alexei‭

66%
+2 −0
Rationale of using database-level transactions inside a store procedure when application layer already manages a transaction

One of the legacy applications my team has to maintain has almost always this pattern for dealing with data modification: try { // get the connection // begin transaction // optional...

0 answers  ·  posted 2y ago by Alexei‭  ·  edited 2y ago by Canina‭

75%
+4 −0
What are the disadvantages of using auto mapper libraries?

I have noticed that lots of projects (both in real-world and within online courses) use Automapper to map domain models to view models, API models. The main advantage seems to be convenience by re...

2 answers  ·  posted 2y ago by Alexei‭  ·  edited 2y ago by Alexei‭

66%
+2 −0
Collapsing AppBar with two Toolbars

I am trying to create an app with two toolbars on top and a specific collapsing/expanding behaviour on scrolling. See the mockup to get a deeper understanding of what I'm trying to achieve: I fo...

0 answers  ·  posted 2y ago by BenjyTec‭

80%
+6 −0
When stored procedures are preferred over application layer code?

A person I used to work with several years ago was hired to rewrite a product using a .NET-based modern tech stack. One of the aspects that stroke me was that he believes that the product should mo...

2 answers  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

75%
+4 −0
In the current development context (2020+), is there any reason to use database triggers?

I have not used a database trigger in years in the projects of the teams I have worked in, but I have seen them being used by other teams. Back in 2009, it seemed like a heated debate, but I am wo...

1 answer  ·  posted 2y ago by Alexei‭  ·  last activity 2y ago by Derek Elkins‭

75%
+4 −0
What advantages does Agner Fog's VCL have over OpenMP?

Agner Fog has this C++ Vector Class Library, which is ... useful for improving code performance where speed is critical and where the compiler is unable to vectorize the code automatically in an...

1 answer  ·  posted 2y ago by anatolyg‭  ·  edited 2y ago by Alexei‭

77%
+5 −0
Kotlin FloatArray from Iterable<Float>

Suppose I am using a Java API from Kotlin and I want to call a function that takes a FloatArray (represented as float[] in Java), and I have an Iterable<Float> as my input data type. To be mo...

1 answer  ·  posted 2y ago by Josh Hyatt‭  ·  edited 2y ago by Alexei‭

66%
+6 −2
Why object-oriented instead of class-oriented?

I understand that in object-oriented programming, an object is an instance of a class. If it's an instance, I misunderstand why does it need the term object at all (we could just say "instance"). ...

4 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by hkotsubo‭