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How to detect if a property exists on an ExpandoObject?
...ject will throw if you check for null on a property that doesn't exist. In order to get MVC ViewBag's gentler functionality out of your dynamic objects, you'll need to use an implementation of dynamic that doesn't throw.
You could simply use the exact implementation in MVC ViewBag:
. . .
public ov...
Grep only the first match and stop
...u can pipe grep result to head in conjunction with stdbuf.
Note, that in order to ensure stopping after Nth match, you need to using stdbuf to make sure grep don't buffer its output:
stdbuf -oL grep -rl 'pattern' * | head -n1
stdbuf -oL grep -o -a -m 1 -h -r "Pulsanti Operietur" /path/to/dir | he...
Repository access denied. access via a deployment key is read-only
... So I deleted the key in repository and added it in my profile settings in order to get it working.
– lyubeto
Mar 12 '17 at 20:18
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How do I iterate over an NSArray?
...re is one very interesting feature: concurrent enumeration. If enumeration order is not important and the jobs can be done in parallel without locking, this can provide a considerable speedup on a multi-core system. More about that in the concurrent enumeration section.
[myArray enumerateObjectsUsi...
In php, is 0 treated as empty?
...aning of without value. Like the others said you'll have to use isset() in order to check if a variable has been defined, which is what you do.
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Need for predictable random generator
... put 1 critical and 4 non-critical hits in a bag. Then you randomize their order in the bag and pick them out one at a time. When the bag is empty, you fill it again with the same values and randomize it. That way you will get in average 1 critical hit per 5 hits, and at most 2 critical and 8 non-cr...
Edit the root commit in Git?
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Doesn't this mean that, in order for this to work, you need to have the foresight (or be psychic) to make an empty commit right at the very beginning of your project? This seems to be extremely situational, to me, and generally not practical. What do y...
dismissModalViewControllerAnimated deprecated
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The warning is still there. In order to get rid of it I put it into a selector like this:
if ([self respondsToSelector:@selector(dismissModalViewControllerAnimated:)]) {
[self performSelector:@selector(dismissModalViewControllerAnimated:) withObject:[...
Python's many ways of string formatting — are the older ones (going to be) deprecated?
...rase was removed later, in commit Close #4966: revamp the sequence docs in order to better explain the state of modern Python. This might seem like a sign that a plan to deprecate % formatting was back on the cards... but diving into the bug tracker reveals that the intent was the opposite. On the b...
What are the differences between Abstract Factory and Factory design patterns?
...o create objects in a class. It's usually added in the aggregate root (The Order class has a method called CreateOrderLine)
Abstract factory
In the example below we design an interface so that we can decouple queue creation from a messaging system and can therefore create implementations for dif...