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How to check if array element exists or not in javascript?
... for if(arrayName[index] === undefined) you may use even shorter one which is if(!arrayName[index])
– Park JongBum
Jul 17 '18 at 14:09
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List or IList [closed]
Can anyone explain to me why I would want to use IList over List in C#?
18 Answers
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Assigning a variable NaN in python without numpy
...gt;> import math
>>> math.isnan(nan)
True
Before Python 3.5, one could use float("nan") (case insensitive).
Note that checking to see if two things that are NaN are equal to one another will always return false. This is in part because two things that are "not a number" cannot (strict...
Why / when would it be appropriate to override ToString?
...and you should to. I can't tell you how my code has improved just by this one guideline for ToString. The same thing goes for things like IEquatable(Of T) and IComparable(Of T). These things make your code very functional, and you won't regret taking the extra time to implement any of it.
Personal...
Converting bytes to megabytes
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BTW: Hard drive manufacturers don't count as authorities on this one!
Oh, yes they do (and the definition they assume from the S.I. is the correct one). On a related issue, see this post on CodingHorror.
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Adding a directory to $LOAD_PATH (Ruby)
... I see the advantages of doing this in case you're not working with a gem. One seems more verbose than the other, obviously, but is there a reason to go with one over the other?
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Express-js wildcard routing to cover everything under and including a path
I'm trying to have one route cover everything under /foo including /foo itself. I've tried using /foo* which work for everything except it doesn't match /foo . Observe:
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Add Keypair to existing EC2 instance
...mote EC2 instance, however, seems distant and inaccessible when you are in one of these situations. Fortunately, AWS provides us with the power and flexibility to be able to recover a system like this, provided that we are running EBS boot instances and not instance-store.
The approach on EC2 is so...
Returning unique_ptr from functions
...rmed as if the object were designated by an rvalue.
Just wanted to add one more point that returning by value should be the default choice here because a named value in the return statement in the worst case, i.e. without elisions in C++11, C++14 and C++17 is treated as an rvalue. So for exampl...
How to keep the console window open in Visual C++?
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For anyone who cannot get this solution to work in a makefile project, this is due to a bug in Visual Studio. I've just posted an answer with the fix.
– JBentley
Apr 25 '14 at 10:28
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