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Most efficient way to prepend a value to an array
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I'm not sure about more efficient in terms of big-O but certainly using the unshift method is more concise:
var a = [1, 2, 3, 4];
a.unshift(0);
a; // => [0, 1, 2, 3, 4]
[Edit]
This jsPerf benchmark shows that unshift is decently fas...
How do I check if an index exists on a table field in MySQL?
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Use SHOW INDEX like so:
SHOW INDEX FROM [tablename]
Docs: https://dev.mysql.com/doc/refman/5.0/en/show-index.html
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How to compare only date components from DateTime in EF?
I am having two date values, one already stored in the database and the other selected by the user using DatePicker. The use case is to search for a particular date from the database.
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Get a list of URLs from a site [closed]
I'm deploying a replacement site for a client but they don't want all their old pages to end in 404s. Keeping the old URL structure wasn't possible because it was hideous.
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How to add leading zeros?
I have a set of data which looks something like this:
8 Answers
8
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Set up adb on Mac OS X
I spent quite sometime figuring how to set up adb on Mac, so I figure writing how to set it up might be useful to some people. adb is the command line tool to install and run android apps on your phone/emulator
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Check if key exists and iterate the JSON array using Python
I have a bunch of JSON data from Facebook posts like the one below:
7 Answers
7
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Showing all errors and warnings [duplicate]
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Display errors could be turned off in the php.ini or your Apache configuration file.
You can turn it on in the script:
error_reporting(E_ALL);
ini_set('display_errors', '1');
You should see the same messages in the PHP error log.
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Growing Amazon EBS Volume sizes [closed]
... with Amazon's EC2 and EBS services. I wanted to know if it is possible to grow an EBS Volume.
11 Answers
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Is there a better way to do optional function parameters in JavaScript? [duplicate]
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Your logic fails if optionalArg is passed, but evaluates as false - try this as an alternative
if (typeof optionalArg === 'undefined') { optionalArg = 'default'; }
Or an alternative idiom:
optionalArg = (typeof optionalArg === '...