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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)
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 2y 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

62%
+3 −1
cannot initialize a variable of type 'CFDictionaryRef'

Background story: I'm on mac OS 11.6 and would like to access an identifier for the current space/desktop from the command line. I found a helpful article at https://ianyh.com/blog/identifying-spac...

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

70%
+5 −1
A keydown event succeeds for an English letter but not for an Hebrew one, sharing the same key

I am trying to listen to the event in which the keyboard key containing the Hebrew final-letter ך is pressed. This key stands for both the English letter L and the Hebrew final letter ך. If my op...

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

85%
+10 −0
What does the "\s" shorthand match?

I've seen some regular expressions (regex) using \s when they want to match a space, but I noticed that it also matches line breaks. Example: the regex [a-z]\s[0-9] (lowercase ASCII letter, follow...

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

77%
+5 −0
C Language Standard Linking Specifications

What (if anything) does the C standard have to say about linking objects? My guess is that, because C only defines language->behavior rules, it completely ignores any potential intermediate form...

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

60%
+4 −2
Question regarding an error message in my compiler to do with my code on linked list.

Can anyone help me, I'm currently learning pointers, this is the code I wrote to try and insert a node at the beginning of the list. However at the part where I included the comment of "error at th...

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

75%
+4 −0
Appropriate HTTP status code for "user confirmation required"

I'm working on a system where the frontend will make a call to the backend to perform an action. Sometimes this action can cause other unintended consequences (like charging the customer), in thes...

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

28%
+0 −3
How to implement "Loss leader" marketing pattern in ecommerce websites? [closed]

Loss leader is a marketing pattern implemented in stores: A customer enters a store and while heading to some most desired expensive products far from entrance, that customer picks some products s...

0 answers  ·  posted 2y ago by deleted user  ·  closed 2y ago by Alexei‭

77%
+5 −0
How to manage CPU capabilities of Jenkins nodes?

We use Jenkins Pipeline to build and test some C++ software. The pipeline script runs the tests on 10 different nodes in a parallel way in order to save time. All of these nodes are real (not virtu...

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

50%
+2 −2
Manipulate a web browser to hide a certain HTML element in a certain website by a single action

Before I publish a new webpage in my website (in the content management system itself), I zoom in from say 100% zooming to 500% zooming and then re-read it, as a nice way to check for typos. The p...

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

86%
+11 −0
What is malloc's standard-defined behavior with respect to the amount of memory it allocates?

I recently told a friend that malloc(n) allocates and returns a pointer to a block of at least N bytes of memory, as opposed to exactly N; that it is allowed to allocate 'extra' memory to meet e.g....

2 answers  ·  posted 2y ago by ajv‭  ·  last activity 2y ago by bta‭

66%
+2 −0
How to create fire and forget tasks Q&A in ASP.NET Core with dependency injection support?

One of the legacy applications our team manages contained the following pattern (in the controller): // initialization private readonly IServiceScopeFactory _serviceScopeFactory; public FooCon...

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

40%
+0 −1
How to mock LazyCache when performing unit testing?

A few of my services rely on LazyCache and they use it by injecting IAppCache. For unit testing, I would like to mock this. I have found MockCachingService, but it does not do any caching (as spec...

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

84%
+14 −1
What's the correct way to merge a branch and its dependent branch back to master?

In git I branched feature-A from master. To reduce eventual merge conflicts later, I branched feature-B, which heavily overlaps and depends on A, from feature-A. A build of the feature-B branch s...

2 answers  ·  posted 2y ago by Monica Cellio‭  ·  edited 2y ago by hkotsubo‭