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How can I reverse a NSArray in Objective-C?
... take advantage of the built-in reverseObjectEnumerator method on NSArray, and the allObjects method of NSEnumerator:
NSArray* reversedArray = [[startArray reverseObjectEnumerator] allObjects];
allObjects is documented as returning an array with the objects that have not yet been traversed with n...
Infinite Recursion with Jackson JSON and Hibernate JPA issue
...ks to As Zammel AlaaEddine for pointing this out).
JsonManagedReference and JsonBackReference
Since Jackson 1.6 you can use two annotations to solve the infinite recursion problem without ignoring the getters/setters during serialization: @JsonManagedReference and @JsonBackReference.
Explanatio...
Extracting specific columns from a data frame
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.
10 Answers
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How to Turn Off Showing Whitespace Characters in Visual Studio IDE
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I find it useful because our coding standards prohibit any trailing whitespace so this allows me to see any. I am not able to install add ons to fix it for me as we use the Express version.
– Stefan
Aug 28 '14 at 7:43
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Wait for a void async method
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Best practice is to mark function async void only if it is fire and forget method, if you want to await on, you should mark it as async Task.
In case if you still want to await, then wrap it like so await Task.Run(() => blah())
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Turn Pandas Multi-Index into column
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The reset_index() is a pandas DataFrame method that will transfer index values into the DataFrame as columns. The default setting for the parameter is drop=False (which will keep the index values as columns).
All you have to do add .reset_index(in...
How to avoid “RuntimeError: dictionary changed size during iteration” error?
...n you want to delete an object in inner dict. for example you have a dic A and dict B in dict A. if you want to delete object in dict B it occurs error
– Ali-T
Apr 18 at 6:35
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TransactionScope automatically escalating to MSDTC on some machines?
...t the same time, which would result in multiple "physical" TCP connections and thus require escalation.
I see some of your developers have SQL Server 2005 and others have SQL Server 2008. Are you sure you have correctly identified which ones are escalating and which not?
The most obvious explanati...
How do I find out which settings.xml file maven is using
I recently changed my password and have to change my maven settings.xml file to reflect that. However, no matter what I do in the settings.xml file, the changed password just won't get picked up. Out of desperation, I ran maven with the -s switch ( mvn -s <my intended settings.xml file> ) and ...
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
... properly).
Use the second option if you need to ensure data consistency, and each thread needs to have an up-to-date view of the map. Use the first if performance is critical, and each thread only inserts data to the map, with reads happening less frequently.
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