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Deep null checking, is there a better way?
...on is ParameterExpression))
throw new ApplicationException(String.Format("The expression '{0}' contains unsupported constructs.",
expression));
object a = arg;
while(stack.Count > 0)
...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...，你也可以定义成不同的类型的数组，比如：arr = {"string", 100, "haoel", function() print("coolshell.cn") end}复制代码
注：其中的函数可以这样调用：arr[4]()。我们可以看到Lua的下标不是从0开始的，是从1开始的。for i...
WaitAll vs WhenAll
...lic class CustomException : Exception
{
public CustomException(String message) : base(message)
{ }
}
static void WaitAndThrow(int id, int waitInMs)
{
Console.WriteLine($"{DateTime.UtcNow}: Task {id} started");
Thread.Sleep(waitInMs);
throw ne...
Type Checking: typeof, GetType, or is?
...is basically a whole bunch of methods with the appropriate type. Example:
string Foo<T>(T parameter) { return typeof(T).Name; }
Animal probably_a_dog = new Dog();
Dog definitely_a_dog = new Dog();
Foo(probably_a_dog); // this calls Foo<Animal> and returns "Animal"
Foo<Animal>...
Determine project root from a running node.js application
...re('path');
var globalRoot = __dirname; //(you may have to do some substring processing if the first script you run is not in the project root, since __dirname refers to the directory that the file is in for which __dirname is called in.)
//compare the last directory in the globalRoot path...
CASCADE DELETE just once
...hus foreign) keys. Also, the keys all have to be able to be represented in string form, but it could be written in a way that doesn't have that restriction. I use this function VERY SPARINGLY anyway, I value my data too much to enable the cascading constraints on everything.
Basically this function ...
How do I implement basic “Long Polling”?
...ew message arrives).
Here is a really basic example, which sends a simple string after 2-10 seconds. 1 in 3 chance of returning an error 404 (to show error handling in the coming Javascript example)
msgsrv.php
<?php
if(rand(1,3) == 1){
/* Fake an error */
header("HTTP/1.0 404 Not Found...
Java 7 language features with Android
...re those which do not depend on the library:
Diamond operator (<>)
String switch
Multiple-catch (catch (Exc1 | Exc2 e))
Underscore in number literals (1_234_567)
Binary literals (0b1110111)
And these features cannot be used yet:
The try-with-resources statement — because it requires th...
Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...
Be aware that if you are using
getSharedPreferences(String sharedPreferencesName, int sharedPreferencesMode)
to retrieve preferences you have to use
PreferenceManager.setDefaultValues(Context context, String sharedPreferencesName, int sharedPreferencesMode, int resId, boolea...
Detect if the app was launched/opened from a push notification
... dictionary has the data you expect
if let type = userInfo["type"] as? String where type == "status" {
// IF the wakeTime is less than 1/10 of a second, then we got here by tapping a notification
if application.applicationState != UIApplicationState.Background && NSDate().tim...