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How to check whether a string is a valid HTTP URL?
...ult.Scheme == Uri.UriSchemeHttp;
Or, if you want to accept both HTTP and HTTPS URLs as valid (per J0e3gan's comment):
Uri uriResult;
bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult)
&& (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHtt...
Asking the user for input until they give a valid response
...u are not able to vote in the United States.")
Encapsulating it All in a Function
If you need to ask your user for a lot of different values, it might be useful to put this code in a function, so you don't have to retype it every time.
def get_non_negative_int(prompt):
while True:
tr...
Set the location in iPhone Simulator
...
123
As of iOS 5, the simulator has a configurable location.
Under the Debug menu, the last entry ...
How do I profile memory usage in Python?
...
123
This one has been answered already here: Python memory profiler
Basically you do something li...
nginx 基础配置全攻略，入门这一篇就够了！ - 更多技术 - 清泛网 - 专注C/C...
...就够了！nginx_basenginx 基础配置，包括ssl配置，http自动转https配置，自动加www的配置。
1、基础配置如下：
server {
listen 80;
listen [::]:80;
location / {
rewrite ^(.*)$ https://www.tsingfun.com$1 permanent;
}
}
server {
listen 443 ssl default_se...
Checking in of “commented out” code [closed]
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123
There may be others with different experiences, but in mine checking in half-finished code is ...
Memoization in Haskell?
... f does what you mean for small values of f by calling, for example: fix f 123 = 144
We could memoize this by defining:
f_list :: [Int]
f_list = map (f faster_f) [0..]
faster_f :: Int -> Int
faster_f n = f_list !! n
That performs passably well, and replaces what was going to take O(n^3) time...
Why does one use dependency injection?
...iled. It just seems silly. My code is never a mess; I hardly write virtual functions and interfaces (although I do once in a blue moon) and all my configuration is magically serialized into a class using json.net (sometimes using an XML serializer).
...
Use of Finalize/Dispose method in C#
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123
The official pattern to implement IDisposable is hard to understand. I believe this one is bet...
What are the differences between a pointer variable and a reference variable in C++?
...e of that object becomes the lifetime of the reference.
std::string s1 = "123";
std::string s2 = "456";
std::string s3_copy = s1 + s2;
const std::string& s3_reference = s1 + s2;
In this example s3_copy copies the temporary object that is a result of the concatenation. Whereas s3_reference in...