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What are important languages to learn to understand different approaches and concepts? [closed]
...nd a bottle of vodka, everything looks like the lock on the door of Wolf Blitzer's boathouse. (Replace that with a hammer and a nail if you don't read xkcd)
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For-each over an array in JavaScript
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TL;DR
Don't use for-in unless you use it with safeguards or are at least aware of why it might bite you.
Your best bets are usually
a for-of loop (ES2015+ only),
Array#forEach (spec | MDN) (or its relatives some and such) (ES5+ only),
a simple old-fashioned for...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
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Why is it impossible to build such a compiler?
For the same reason that you can't write a program that will determine whether any given program will terminate. This is known as the halting problem, and it's one of those things tha...
Java Interfaces/Implementation naming convention [duplicate]
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Name your Interface what it is. Truck. Not ITruck because it isn't an ITruck it is a Truck.
An Interface in Java is a Type. Then you have DumpTruck, TransferTruck, WreckerTruck, CementTruck, etc that implement Truck.
When you are using the Interf...
How to navigate through a vector using iterators? (C++)
...ngs instead of the [] operator or the "at" method. From what I understand, iterators can be used to navigate through containers, but I've never used iterators before, and what I'm reading is confusing.
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Correct way to use StringBuilder in SQL
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The aim of using StringBuilder, i.e reducing memory. Is it achieved?
No, not at all. That code is not using StringBuilder correctly. (I think you've misquoted it, though; surely there aren't quotes around id2 and table?)
Note that the aim (usually) is to reduce memory churn rat...
Can someone copyright a SQL query? [closed]
...e to export a list of students from our student management system and send it to a company that handles our online exams.
7...
IsNothing versus Is Nothing
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If you take a look at the MSIL as it's being executed you'll see that it doesn't compile down to the exact same code. When you use IsNothing() it actually makes a call to that method as opposed to just evaluating the expression.
The reason I would tend to l...
Difference between Hashing a Password and Encrypting it
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Hashing is a one way function (well, a mapping). It's irreversible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what's called "a collision", that is, finding a different string that provides the same ha...
Is the pImpl idiom really used in practice?
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So, I am wondering it this technique is really used in practice? Should I use it everywhere, or with caution?
Of course it is used. I use it in my project, in almost every class.
Reasons for using the PIMPL idiom:
Binary compatibility
W...