The Big Programming Thread - Page 677

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.

WarSame

Canada1950 Posts

November 16 2015 20:06 GMT

#13521

What are your opinions on the best Javascript IDE? Writing it normally is kinda painful. I tried WebStorm and it looked good but it costs money. What are good free options?

Acrofales

Spain18318 Posts

November 16 2015 20:34 GMT

#13522

On November 16 2015 05:27 Cyx. wrote:

Show nested quote +

I know a lot of C programmers who prefer


while ((c = getchar()) != EOF) {...}


char c = getchar();
while (c != EOF) {
  ...
  c = getchar();
}

I used to really dislike assignments in conditionals too, but in this situation, it significantly reduces the typing and repetition necessary to manage the loop variable, so... I don't mind it at all now, especially since any decent C compiler will warn you if there's an un-bracketed assignment in a condition.

Yeah. I don't mind assignment in a while loop as long as it is completely explicitly separate from the condition, as in the code sample you gave. It gets hairy when you assign and implicitly check for something that breaks out of the clause (such as assigning 0 to your variable).

And in if statements it just plain always gets my hackles up. Assignments don't belong in if conditions.

tofucake

Hyrule19221 Posts

November 16 2015 20:46 GMT

#13523

On November 17 2015 05:06 WarSame wrote:
What are your opinions on the best Javascript IDE? Writing it normally is kinda painful. I tried WebStorm and it looked good but it costs money. What are good free options?

At my company devs use a mix of Sublime (me and another guy), Atom (one guy), and something else (other guy on a different project). I personally love Sublime, and you can get some extensions to make autocompletes and code-aware upgrades.

Nyxisto

Germany6287 Posts

November 16 2015 20:50 GMT

#13524

Atom doesn't run smoothly on my 4 year old thinkpad, I'm not kidding. Why do you need a quadcore to run a text-editor? I think IntelliJ is nice as an IDE and for shorter stuff I just use Vim, with AutocompleteMe and some on it's pretty decent for Java.

WarSame

Canada1950 Posts

November 16 2015 22:30 GMT

#13525

The problem is an IDE for JS(complete with tie in to CSS/HTML preferably). I'm looking for something where I can modify the code, and simply hit a button to reset the page it's in. This is technically possible in any editor+console+browser, but I was hoping for something with auto-complete and error checking(because JS' error checking is non-existent apparently).

Blitzkrieg0

United States13132 Posts

November 16 2015 23:16 GMT

#13526

Have you tried using liveweave? The error checking is kinda useless, but it will tell you one is there. It certainly is not as strong as an IDE, but it has css/html/js integrated.

WarSame

Canada1950 Posts

November 16 2015 23:36 GMT

#13527

That looks promising and almost exactly what I want! Thanks for the recommendation. I would LOVE to see a full-blown IDE similar to that.

TMG26

Portugal2017 Posts

November 17 2015 03:33 GMT

#13528

Not for me, i'm a student, YEAH!

WarSame

Canada1950 Posts

November 17 2015 03:55 GMT

#13529

Ahhh you bugger! I just graduated this year, so I have no money for it, and no longer have student access. :'(

Itsmedudeman

United States19229 Posts

November 17 2015 04:22 GMT

#13530

Is there a better way to write nested if statements? The && operator doesn't seem that good if I have multiple different conditions within an if statement. If I have like several nested conditions the code just looks.... off and it's not that easy to read at first glance.

Cyx.

Canada806 Posts

November 17 2015 05:21 GMT

#13531

On November 17 2015 04:05 spinesheath wrote:

Show nested quote +

On November 16 2015 05:27 Cyx. wrote:

On November 16 2015 04:26 spinesheath wrote:
Assignment in if conditions is never forgiveable, be it line reading or anything else.

Putting the constant first makes code harder to read - at least for me and all the programmers I know. And it only fixes part of the problem. It doesn't do anything when you compare/assign two variables. You should just rely on automated code checks to prevent that kind of stuff. Just have it enforce a "no assignment in condition" rule.

I know a lot of C programmers who prefer


while ((c = getchar()) != EOF) {...}


char c = getchar();
while (c != EOF) {
  ...
  c = getchar();
}

I hope you treat warnings as errors then, though. Obviously the most important part is that you can't make these kinds of mistakes. If you have an automatic check in place that only allows 100% safe assignments then I guess that's fine.

Well, I can't turn -Werror on at work but I never commit compiler warnings

so I feel pretty good about this one generally.

On November 16 2015 04:26 spinesheath wrote:
Plus I usually don't go as low level as reading a file line by or character by character. I instead use a method that enumerates the lines or characters for me. I'm thinking C# here, but surely C can do similar things too.

That was a bit of a simplified example - but googling 'strtok linux lxr' got me to http://lxr.free-electrons.com/source/arch/s390/hypfs/inode.c#L225 (after I learned that the Linux kernel actually uses a function called strsep() and not strtok()) which is a pretty solid example of this idiom in real-world C code.

phar

United States1080 Posts

November 17 2015 06:30 GMT

#13532

On November 17 2015 13:22 Itsmedudeman wrote:
Is there a better way to write nested if statements? The && operator doesn't seem that good if I have multiple different conditions within an if statement. If I have like several nested conditions the code just looks.... off and it's not that easy to read at first glance.

if (foo
    && bar
    && baz
    && zyzzy) {
  ...
}

If you have too many conditions you may be approaching the problem in a convoluted way, try simplifying the amount of state you're holding.

Itsmedudeman

United States19229 Posts

November 17 2015 09:12 GMT

#13533

I meant something that could look like


if(count == 500) {
   s++;
   if(s > 59) {
      m++;
      s = 0;
      if(m > 59) {
         h++;
         m = 0;
         if(h > 12)
            h = 0;
      }
   }
}

I could probably think of a better example where it just looks unreadable, but you get my point.

Ropid

Germany3557 Posts

November 17 2015 10:50 GMT

#13534

That's just how it is.

Some languages have "stuff" where you don't have to manually manage state of things like loops. That can then be composed together. Like, if your example is C#, you might want to look at LINQ and see if it can help you write it looking like


things
.Select(...)
.Select(...)
.Where(...)
.ToList()
.ForEach(... {
     ...
});

In Java 8 the lambda expressions together with streams do that.

I assume C++ has a whole bunch of template libraries that do something similar.

enigmaticcam

United States280 Posts

November 17 2015 17:54 GMT

#13535

So I'll be starting a personal web project soon, all Microsoft .NET C# and ASP/MVC. Up until now, I've done very little javascript. But this project will have complex UI logic, things like if you check one box then these other boxes need to be enabled, etc. I want it to be as streamlined as possible for the user, so it feels like a lot of that UI work should be done on the client. But I've never really been able to close that gap between javascript and business rules wrapped in class objects. I don't want to just simply write some JS to do X. I'd rather write some type of dynamic layer that can interpret business rules and build the JS, so I don't have to rewrite a whole bunch of JS every time a rule changes.

Anybody know of any resources out there that can help me? Maybe a book or something? My attempts at google have yielded limited results.

Thaniri

1264 Posts

November 17 2015 18:06 GMT

#13536

That honestly sounds like you're over complicating a website.

If all you're doing is form controls then you can write simple onclick events where if one box is checked then other html elements get checked/appear in the dom.

You'd be using javascript to manipulate html element attributes in that case.

WarSame

Canada1950 Posts

November 17 2015 18:23 GMT

#13537

Every time business rules change, a lot of the code changes. That's why most legit projects design what they are going to do before implementing it. Otherwise you have to go back and change a lot. Try to have an idea of what you're going to do beforehand, but don't worry if you have to go and change things. It's a process.

Thaniri is right about you overcomplicating it. That type of implementation in js is not that hard. If checking a check box makes all other check boxes in a set become checked, then use a list of that set of check boxes. When you need to check them all just loop through the list and check them one by one.

Manit0u

Poland17768 Posts

November 17 2015 18:50 GMT

#13538

On November 18 2015 02:54 enigmaticcam wrote:
So I'll be starting a personal web project soon, all Microsoft .NET C# and ASP/MVC. Up until now, I've done very little javascript. But this project will have complex UI logic, things like if you check one box then these other boxes need to be enabled, etc. I want it to be as streamlined as possible for the user, so it feels like a lot of that UI work should be done on the client. But I've never really been able to close that gap between javascript and business rules wrapped in class objects. I don't want to just simply write some JS to do X. I'd rather write some type of dynamic layer that can interpret business rules and build the JS, so I don't have to rewrite a whole bunch of JS every time a rule changes.

Anybody know of any resources out there that can help me? Maybe a book or something? My attempts at google have yielded limited results.

You should really look into integrating AngularJS into your application then. It can handle all of the UI logic very well, works great with RESTful applications and can also improve UX and reduce server load if done correctly.

On November 17 2015 18:12 Itsmedudeman wrote:
I meant something that could look like


if(count == 500) {
   s++;
   if(s > 59) {
      m++;
      s = 0;
      if(m > 59) {
         h++;
         m = 0;
         if(h > 12)
            h = 0;
      }
   }
}

I could probably think of a better example where it just looks unreadable, but you get my point.

Well, what you're describing here is pretty much the Arrow anti-pattern. The only way to combat it is structuring your code better.

In the case above, you could separate that stuff into different function calls.


struct Counters {
    int x;
    int y;
    int z;
};

struct Counters *Counters_create(int x, int y, int z)
{
    struct Counters *counters = malloc(sizeof(struct Counters));
    
    assert(counters != NULL);

    counters->x = 0;
    counters->y = 0;
    counters->z = 0;

    return counters;
}

void Counters_destroy(struct Counters *counters)
{
    assert(counters != NULL);

    free(counters);
}

void Counters_test_all(struct Counters *counters, int n)
{
    if (n == 500)
    {
        counters->x += 1;

        Counters_test_x(counters, counters->x);
    }
}

void Counters_test_x(struct Counters *counters, int n)
{
    if (n > 59)
    {
        counters->y += 1;
        counters->x = 0;

        Counters_test_y(counters, counters->y);
    }
}

void Counters_test_y(struct Counters *counters, int n)
{
    if (n > 59)
    {
        counters->z += 1;
        counters->y = 0;

        Counters_test_z(counters, counters->z);
    }
}

void Counters_test_z(struct Counters *counters, int n)
{
    if (n > 12)
    {
        counters->z = 0;
    }
}

int main(int argc, char *argv[])
{
    struct Counters *counters = Counters_create(0, 0, 0);
    int count = 0;

    while (count < 501) {
        Counters_test_all(counters, count);
    }

    Counters_destroy(counters);

    return 0;
}

My C is pretty rusty, but I hope you catch the drift

Edit:
Obviously, my code is still pretty bad but way more vertical instead of horizontal. Instead of adding another block indentation you simply add another function to update your counters, which you keep in a struct somewhere and can access from other places too if required. It seems like more code, but it's actually way more managable since it's more compartmentalized.

Cyanocyst

2222 Posts

November 17 2015 19:15 GMT

#13539

Hey guys, I have literally no coding experience at all. Disappointingly I graduated with degrees in Accounting and Finance last year. But i honestly hate both subjects.

Anyway my university requires significantly more math as pre-requisites for computer science, than it did for either of my majors.

Is high level math directly needed to code at all? I understand that more math could probably sharpen your problem solving skills, and that could indirectly help your coding. Though wanting to know if it is directly related to any language.

Also what is the easiest language to learn for a complete noob? I would like to try to teach my self some kind of coding just to see if it truly is something i'm interested in.

Due to already having degrees, and not wanting to pay for more of them, no matter what, i'll probably never actually be good at this. Though maybe i could make a hobby out of it.

solidbebe

Netherlands4921 Posts

November 17 2015 20:03 GMT

#13540

On November 18 2015 04:15 Cyanocyst wrote:
Hey guys, I have literally no coding experience at all. Disappointingly I graduated with degrees in Accounting and Finance last year. But i honestly hate both subjects.

Anyway my university requires significantly more math as pre-requisites for computer science, than it did for either of my majors.

Is high level math directly needed to code at all? I understand that more math could probably sharpen your problem solving skills, and that could indirectly help your coding. Though wanting to know if it is directly related to any language.

Also what is the easiest language to learn for a complete noob? I would like to try to teach my self some kind of coding just to see if it truly is something i'm interested in.

Due to already having degrees, and not wanting to pay for more of them, no matter what, i'll probably never actually be good at this. Though maybe i could make a hobby out of it.

There are some programming jobs where you need to have strong math knowledge like games or cgi movies. I'd wager to say this is a very small percentage of programmers who end up in these kinds of fields though.

For any other programming, you don't need anything more than basic arithmetic really.

Good languages to start with I'd say python and java. They are high level so relatively easy to learn and very well supported ( many tutorials and such ).

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