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Handling optional parameters in javascript
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You can know how many arguments were passed to your function and you can check if your second argument is a function or not:
function getData (id, parameters, callback) {
if (arguments.length == 2) { // if only two arguments were s...
How can I reverse a list in Python?
...,2,3,4]
a = a[::-1]
print(a)
>>> [4,3,2,1]
The job is done, and now you have a reversed list.
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Converting .NET DateTime to JSON [duplicate]
...r, that's fine too, but if that means you're doing substring + validation, now you're into multiple lines of code (hopefully in a separate function) which means more things that can go wrong and more programmer time spent (programmers being more expensive than CPUs).
– gregmac
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How do I save a stream to a file in C#?
I have a StreamReader object that I initialized with a stream, now I want to save this stream to disk (the stream may be a .gif or .jpg or .pdf ).
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Ruby on Rails vs ASP.NET MVC 3 for a .NET Guy? [closed]
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Now that ASP.NET MVC is open source, I wonder how quickly it will close the feature gap with RoR. I'm putting my money on MVC3 now that the developer community will have the ability to contribute to a product that is still su...
Can anonymous class implement interface?
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@ZainRizvi No, it didn't. As far as I know, it's still in production. The concern raised seemed strange to me then, and arbitrary at best to me now. It was basically saying "Don't use a framework, things will break!". They didn't, nothing went pop, and I'm not sur...
What is the logic behind the “using” keyword in C++?
...the using keyword can bring member functions into scope. In C++11, you can now do this for constructors (another Bjarne Stroustrup example):
class Derived : public Base {
public:
using Base::f; // lift Base's f into Derived's scope -- works in C++98
void f(char); // provide a new f ...
How to check for file lock? [duplicate]
...very next second (read: short timespan).
Why specifically do you need to know if the file is locked anyway? Knowing that might give us some other way of giving you good advice.
If your code would look like this:
if not locked then
open and update file
Then between the two lines, another pro...
Would it be beneficial to begin using instancetype instead of id?
...entially no type checking at all. With instancetype, the compiler and IDE know what type of thing is being returned, and can check your code better and autocomplete better.
Only use it where it makes sense of course (i.e. a method that is returning an instance of that class); id is still useful.
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How do I move an existing Git submodule within a Git repository?
...nts this answer refers to the steps needed with older versions of git. Git now has native support for moving submodules:
Since git 1.8.5, git mv old/submod new/submod works as expected and does all the plumbing for you. You might want to use git 1.9.3 or newer, because it includes fixes for sub...