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When should null values of Boolean be used?
...ean is useful, for example
to store booleans in a collection (List, Map, etc.)
to represent a nullable boolean (coming from a nullable boolean column in a database, for example). The null value might mean "we don't know if it's true or false" in this context.
each time a method needs an Object as ...
How do I concatenate or merge arrays in Swift?
...be propagated to the next operation along the chain (map, flatMap, filter, etc...).
If lazyness makes sense in your particular case, just remember to prepend or append a .lazy to flatten(), for example, modifying Tomasz sample this way:
let c = [a, b].lazy.flatten()
...
How do I intercept a method call in C#?
...wing answer that what should be avoided were Aspect, JointPoint, PointCut, etc. According to Interception documentation from CastleWindsor, none of those are required to accomplish what is asked.
Configure generic registration of an Interceptor, based on the presence of an attribute:
public class ...
How do I write a correct micro-benchmark in Java?
... iterations.)
Rule 2: Always run with -XX:+PrintCompilation, -verbose:gc, etc., so you can verify that the compiler and other parts of the JVM are not doing unexpected work during your timing phase.
Rule 2.1: Print messages at the beginning and end of timing and warmup phases, so you can verify th...
What is a classpath and how do I set it?
...s a "gotcha" with all of the above. On most systems (Linux, Mac OS, UNIX, etc) the colon character (':') is the classpath separator. In windowsm the separator is the semicolon (';')
So what's the best way to do it?
Setting stuff globally via environment variables is bad, generally for the same k...
How is null + true a string?
... | same with System.Single, System.Double, System.Decimal, System.TimeSpan etc
var b = (null + new Object()); // String | same with any ref type
Crazy?? No, there must be a reason behind it.
Someone call Eric Lippert...
s...
Difference between >>> and >>
...s a number. For example: Telephone numbers, post codes (in many countries) etc. are strings of decimal digits, but it doesn't make sense to add, subtract or multiply them, so they're not really numbers. They happen to be strings of decimal digits, but should be treated as strings of characters. (Pos...
What are the differences between numpy arrays and matrices? Which one should I use?
...tiply (reduce) two tensors (scalar product,
matrix vector multiplication etc.).
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Unknown provider: $modalProvider
... of error occurs when you write in a dependency for a controller, service, etc, and you haven't created or included that dependency.
In this case, $modal isn't a known service. It sounds like you didn't pass in ui-bootstrap as a dependency when bootstrapping angular. angular.module('myModule', ['ui...
Should I call Close() or Dispose() for stream objects?
Classes such as Stream , StreamReader , StreamWriter etc implements IDisposable interface. That means, we can call Dispose() method on objects of these classes. They've also defined a public method called Close() . Now that confuses me, as to what should I call once I'm done with objects?...