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What is problem? I don't understand.
There are 2 things that could be happening. First, you meant to list Article.all, referencing the class. Second, you're referencing article.all as a array, in which case it hasn't been defined as such in your code.
Also, please don't post images of code. Just copy/paste and use the code formatting tools. It really helps us understand what is going on.
Also, it helps to give as much background as possible, meaning what the code is supposed to do, why you're doing it, etc. The more thorough you are, the more helpful we can be.
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I have a long object update.PostType.RecievedFrom.Id that I need to access many times inside my program,
but I want to shorten it, so it will be more readable, by creating a variable for it id := update.PostType.RecievedFrom.Id. now my question is would this variable be a "zero overhead" variable and will be just replaced as a macro in compile time, or it does affect my program (and if it is, how can I avoid it?)
will be just replaced as a macro in compile time [?]
No.
or it does affect my program
Yes, but in a totally negligible way
(and if it is, how can I avoid it?)
You cannot and you should not bother.
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I have looked through stackoverflow trying to figure this out, since I see alot of questions titled the same as mine. But I get this parse error in a Haskell file which worked perfectly the last time I opened it. I get this error-message
One defines a signature for a function by writing the name of the function, then two consecutive colons (::), and then the signature. You forgot the double colon, you thus write the signature of your concat function with:
-- ↓↓ double colon
concat :: [[a]] -> [a]
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My code is apparently not working, can you help? Its for school project.
x=msgbox("Hello. Make sure you dispose of this computer properly. You can donate to a local school, retirement home, charitable organization, or a community center. You can recycle it or resell it. Let's protect our enviornment one piece of tech at a time. Our tech. Our future. Our job.",1,"Proper Care")
If vbCancel then
CreateObject("WScript.Shell").Run("http://bestanimations.com/Military/Explosions/earth-explosion-animated-gif-2.gif")
If vbOK then
CreateObject("WScript.Shell").Run("https://www.cta.tech/Consumer-Resources/Greener-Gadgets/Recycle-Electronics.aspx")
x=msgbox("If you don't, we might have a horrible future.",16,"Help the environment")
End If
If x=vbCancel then CreateObject("WScript.Shell").Run("http://bestanimations.com/Military/Explosions/earth-explosion-animated-gif-2.gif")
If x=vbOK then
CreateObject("WScript.Shell").Run("https://www.cta.tech/Consumer-Resources/Greener-Gadgets/Recycle-Electronics.aspx")
x=msgbox("If you don't, we might have a horrible future.",16,"Help the environment")
End If
You have two If statements, but only one End If statement. I'm guessing you may want your second If to actually be an ElseIf.
Also, saying If vbCancel doesn't do what you think it does. If you're trying to test the value of x, then you need to be testing the value of x.
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I have applied to couple of startups and most of them are asking to solve programming challenge before they start on the interviewing candidate.
I have submitted couple of the solution and all the time getting rejected in the initial screening.
Now what i think is, they will see my coding style, algorithm and OOD concepts that i have used to solve the problem. Can you guys input more on it as what other details are taken into consideration and how can i improve my coding for getting selected.
By the way, i did all my coding in either Java/Perl.
Nice question, I am a new grad too... One thing I notice: When you do the exercise home, they expect you to use the best algorithm out there. In my opinion code modularity, even on a small function is key. Put lot effort into the code because they are not just judging you, but comparing you against other candidate. The one which seems to have put the more effort wins.
ps: Ask this question on programmers.stackexchange, you will obtain some good inputs there.
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I reviewed some professional code written in Ruby and found no comments. The code was reasonably clear to read but not self-documenting. Should I expect professionally written Ruby code to have comments? Or, is there some Ruby doctrine that comments are not considered essential?
This issue isn't unique to Ruby.
Code comments should be kept to an absolute minimum, because they are usually not updated when the code changes, and become more misleading than helpful.
As you have already suggested, the best code is self-documenting and requires no comments.
Edit: to clarify, if you cannot reduce the code to remove the complexity, you must provide comments. This is rare in my experience, and usually only applies when external components don't behave as you might expect.
Matz, the creator of Ruby, states his philosophy here and there: "The source code is the documentation. It even states all the bugs correctly." And he probably means that for comments as well. I think many people who don't comment in Ruby source code are following his words. Whether for you to follow him is up to you.
I have also read some Ruby introductory websites saying that, whenever you feel the necessity to comment, that is an indication that you should split that routine as in individual method, and name it as you were to comment that part.