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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.

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2.6k posts
 
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Q&A When would one not want to return an interface?

From simple subtyping concerns, you want the arguments of your methods to be as abstract/imprecise as possible while still allowing you to efficiently accomplish your goals. This allows your method...

posted 2y ago by Derek Elkins‭  ·  edited 2y ago by Derek Elkins‭

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Meta Should asking about book recommendations directly connected to software development be on-topic?

I respect Alexei for opening a discussion on this, and Lundin for providing hard-won real world experience. I would like to put in a "pro", on the grounds that "I read this book and I'm a better p...

posted 2y ago by Fred Wamsley‭

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Q&A What is the purpose of grouping the tests in a `tests` module and is it possible to split them?

Grouping related items into modules is of course generally good practice, but it serves a practical purpose as well. The important part here is the #[cfg(test)] annotation. The #[cfg(test)] anno...

posted 2y ago by Moshi‭  ·  edited 1y ago by Moshi‭

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Q&A memcmp(3) memory containing invalid values

What does it mean that we can use memcmp(3) on invalid values? ISO C allows comparing an invalid value through memcmp(3), because it doesn't read the value, but rather its representation, and "rea...

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

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Q&A How to verify if a year is leap in Java?

There are many ways to do it, it depends on what data you already have and/or the Java version. I have only the year's numeric value If you already have a value as a number (int or long), and i...

posted 2y ago by hkotsubo‭  ·  edited 2y ago by hkotsubo‭

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Q&A Why are commas not needed for modulo string formatting when printing?

It is, as you said, an operator so it doesn't make any sense to place a comma somewhere between the operator and the two operands. The first operand is the template string, and the second operand ...

posted 2y ago by __blackjack__‭  ·  edited 2y ago by __blackjack__‭

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Meta How can we grow this community?

Never Too Late Due to, shall we say, recent AI-related hallucinations, pretty much everything that was possible PR-wise in 2019 is possible for this site again. People are leaving Stack Overflow a...

posted 1y ago by Karl Knechtel‭

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Meta On self-answered questions, is it inappropriate to mark my own answer "Works for me" immediately?

Would it discourage others from posting answers, if they saw that a question had an answer with a "works for me" indication applied immediately? (More so than just seeing an immediate, comprehensiv...

3 answers  ·  posted 1y ago by Karl Knechtel‭  ·  last activity 1y ago by matthewsnyder‭

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Q&A How can I build a string from smaller pieces?

Before attempting this, make sure it makes sense in context. In a few particular situations, it would be better to take a different approach rather than using the normal tools for composing or f...

posted 1y ago by Karl Knechtel‭  ·  edited 1y ago by Karl Knechtel‭

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Q&A Child div doesn't inherit parent's div background-color

It's because of this rule: *{ background: rgb(3, 28, 87); } That applies the darker blue background to every element individually, and that isn't overridden when you change the background o...

posted 2y ago by r~~‭

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Q&A grep AND search for multiple words in files

Between-lines relations are not easy to look for with grep, which is a line filter. You could use a regex that spans lines, but I find this annoying because of all the flags you have to set. Grep ...

posted 1y ago by matthewsnyder‭  ·  edited 1y ago by matthewsnyder‭

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Q&A grep AND search for multiple words in files

I have text (xml actually) files. Some files contain 'foo', some contain 'bar', some contain neither and some contain both. It's the both I'm interested in. How do I do an AND search on words in...

5 answers  ·  posted 1y ago by mcalex‭  ·  last activity 1y ago by tripleee‭

Question grep file-handling
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Q&A Is there a naming convention for table aliases?

This can depend on both your flavor of SQL and your personal preference - I've seen a number of schemes in use. For MySQL, the most common scheme I've seen used (and the scheme that my editor uses ...

posted 4y ago by ArtOfCode‭

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Meta Meet the Codidact Team!

As we start on building a new community here together, we're bound to find some sticking points. Those might be bugs, new features you need, things you need support with... whatever they are, the C...

0 answers  ·  posted 4y ago by ArtOfCode‭  ·  edited 4y ago by ArtOfCode‭

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Q&A Why don't format specifiers work with lists, dictionaries and other objects?

When I want to print a number or a string, I can use f-strings (Python >= 3.6) or str.format, and I can use just the variable between braces, or use format specifiers. Ex: num, text = 10, 'abc' ...

1 answer  ·  posted 4y ago by hkotsubo‭  ·  edited 4y ago by sth‭

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Meta How does the community feel about resource requests?

I think these kinds of questions are fine, but I am just one person. open source product I have been using appears to be poorly-documented is an extremely common problem. I have actually seen the p...

posted 4y ago by manassehkatz‭

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Q&A Generate SIGSEGV without undefined behaviour.

SIGSEGV is defined in the C header signal.h. To generate the signal, it should be sufficient to just do raise(SIGSEGV);. As far as I know, this is well-defined behavior.

posted 4y ago by Lundin‭  ·  edited 4y ago by Lundin‭

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Meta Do we need the fullstack tag?

To whether the tag is useful: no. It's useful for tagging people ("this person does frontend and backend") but not questions. I don't see the point of adding "do not use": just delete the tag, whi...

posted 4y ago by Peter Taylor‭

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Q&A How to override default string formatter?

It is possible to create a new formatter class by subclassing string.Formatter class and then to use it like myformatter.format("{foo:customformat}", foo=foo). It's not super-convenient though, and...

1 answer  ·  posted 4y ago by luser‭  ·  edited 4y ago by Alexei‭

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Q&A How to read lines into an array in Bash

Your code is correct. You have declared your variable as an array, and you are successfully appending to it. To display all of the elements of your variable, try echo "${my_array[@]}". (Another an...

posted 3y ago by r~~‭  ·  edited 3y ago by r~~‭

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Q&A Python Regex to parse multiple "word. word. word."

First of all, let's understand why your regex didn't work. The first part is \w+\.\s, which is "one or more alpha-numeric characters" (\w+), followed by a dot and a space (\.\s). If the regex was ...

posted 4y ago by hkotsubo‭  ·  edited 3y ago by hkotsubo‭

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Q&A What are field separators in operating-programming languages (such as Bash)?

In Bash, IFS is an internal variable and it stands for "Internal Field Separator" <- according to this link, it "determines how Bash recognizes fields, or word boundaries, when it interprets cha...

posted 4y ago by hkotsubo‭  ·  edited 4y ago by hkotsubo‭

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Q&A Is it wrong to demand features in open-source projects?

As you have worded it, for most open source project, particularly small ones, I would say "yes", it is "wrong" to demand features. Or rather, it's extremely rude. Most of the time open source soft...

posted 4y ago by Derek Elkins‭

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Meta Growing software.codidact

Speaking personally (not as a Codidact admin): One low-key way to promote this community there is to cite it in answers. If you see a question there that you want to answer, see if it's here too....

posted 4y ago by Monica Cellio‭

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Q&A What is the difference between operator precedence and order of evaluation?

When doing something simple such as this int a=1; int b=2; int c=3; printf("%d\n", a + b * c); then I was told that operator precedence guarantees that the code is equivalent to a + (b * c)...

2 answers  ·  posted 4y ago by Lundin‭  ·  last activity 21d ago by Alexis Wilke‭