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Deserializing a JSON into a JavaScript object
...arse().
var arr_from_json = JSON.parse( json_string );
In browsers that don't, you can include the json2 library.
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Add a default value to a column through a migration
How do I add a default value to a column that already exists through a migration?
7 Answers
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Is Zookeeper a must for Kafka?
...each consumer getting its own copy of data from the broker). Given this, I do not want the overhead of using Zookeeper; Can I not just use the broker only? Why is a Zookeeper must?
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How can I add a column that doesn't allow nulls in a Postgresql database?
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Nice solution. I couldn't get to the online postgres docs for some reason to see what the syntax would be for this.
– Sean Bright
Feb 4 '09 at 17:48
4
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Is 'switch' faster than 'if'?
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There are several optimizations a compiler can make on a switch. I don't think the oft-mentioned "jump-table" is a very useful one though, as it only works when the input can be bounded some way.
C Pseudocode for a "jump table" would be something like this -- note that the compiler in pract...
Most efficient way to remove special characters from string
...rs are A-Z (uppercase or lowercase), numbers (0-9), underscore (_), or the dot sign (.).
24 Answers
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What does cherry-picking a commit with Git mean?
...rge conflicts in the future.
If you have notes attached to the commit they do not follow the cherry-pick. To bring them over as well, You have to use:
git notes copy <from> <to>
Additional links:
git official guide page
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DatabaseError: current transaction is aborted, commands ignored until end of transaction block?
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This is what postgres does when a query produces an error and you try to run another query without first rolling back the transaction. (You might think of it as a safety feature, to keep you from corrupting your data.)
To fix this, you'll want t...
Numpy: Get random set of rows from 2D array
...
>>> A = np.random.randint(5, size=(10,3))
>>> A
array([[1, 3, 0],
[3, 2, 0],
[0, 2, 1],
[1, 1, 4],
[3, 2, 2],
[0, 1, 0],
[1, 3, 1],
[0, 4, 1],
[2, 4, 2],
[3, 3, 1]])
&...
Best practices for Storyboard login screen, handling clearing of data upon logout
...et your navigation flow accordingly
if (authenticatedUser)
{
self.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];
}
else
{
UIViewController* rootController = [[UIStoryboard storyboardWithName:@"M...