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Concurrent HashSet in .NET Framework?
...ere are some workarounds.
ConcurrentDictionary (recommended)
This first one is to use the class ConcurrentDictionary<TKey, TValue> in the namespace System.Collections.Concurrent. In the case, the value is pointless, so we can use a simple byte (1 byte in memory).
private ConcurrentDictiona...
How can I get a list of locally installed Python modules?
...i in installed_packages])
print(installed_packages_list)
As a (too long) one liner:
sorted(["%s==%s" % (i.key, i.version) for i in pip.get_installed_distributions()])
Giving:
['behave==1.2.4', 'enum34==1.0', 'flask==0.10.1', 'itsdangerous==0.24',
'jinja2==2.7.2', 'jsonschema==2.3.0', 'markup...
Is REST DELETE really idempotent?
...the effect is that account 123 is now deleted from the server. That is the one and only effect, the one and only change to the state of the server. Now lets say you do the same DELETE http://example.com/account/123 request again, the server will respond differently, but its state is the same.
Its...
How do I sort a list by different parameters at different timed
... Since no answer stood out as the clear alternative, I'm gonna accept this one because I like the elegance, but I urge anyone viewing this answer to check the other approaches as well.
– runaros
Sep 15 '09 at 21:31
...
getApplication() vs. getApplicationContext()
...pplicationContext() is declared in the Context class.
That actually means one thing : when writing code in a broadcast receiver, which is not a context but is given a context in its onReceive method, you can only call getApplicationContext(). Which also means that you are not guaranteed to have acc...
MySQL vs MongoDB 1000 reads
...ormance.
In MongoDB, to retrieve the whole entity, you have to perform:
One index lookup on the collection (assuming the entity is fetched by id)
Retrieve the contents of one database page (the actual binary json document)
So a b-tree lookup, and a binary page read. Log(n) + 1 IOs. If the index...
Find out which remote branch a local branch is tracking
...ee as it being the correct answer. It's an answer the same way giving someone a dictionary answers "how do you spell XYZ". case in point, you want to USE the resulting answer (the branch name) for some operation.. This answer only helps me visually see it... doesn't give you something usable in a ...
Creating a comma separated list from IList or IEnumerable
... exactly what the performance is like, including (but not limited to) this one.
As of .NET 4.0, there are more overloads available in string.Join, so you can actually just write:
string joined = string.Join(",", strings);
Much simpler :)
...
Is it safe to assume a GUID will always be unique?
...ample), would it be safe to assume they're all unique to save testing each one?
6 Answers
...
Get domain name from given url
...usted inputs.
"Mr. Gosling -- why did you make url equals suck?" explains one such problem. Just get in the habit of using java.net.URI instead.
public static String getDomainName(String url) throws URISyntaxException {
URI uri = new URI(url);
String domain = uri.getHost();
return dom...