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How to check a not-defined variable in JavaScript
...-assignable was fixed in ECMAScript 5, which was released in 2009. You can now safely use === and !== to test for undefined without using typeof as undefined has been read-only for some time.
If you want to know if a member exists independent but don't care what its value is:
if ('membername' in o...
JPA OneToMany not deleting child
...e JPA doesn't cater for it.
In part this is because JPA doesn't actually know if it should delete something removed from the collection. In object modeling terms, this is the difference between composition and "aggregation*.
In composition, the child entity has no existence without the parent. A c...
Change timestamps while rebasing git branch
...hen I asked this question I also wanted to change the date of that commit. Now we have --root, which makes this possible.
– tarsius
Nov 26 '15 at 1:24
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Copy rows from one Datatable to another DataTable?
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Supported in: 4, 3.5 SP1, you can now just call a method on the object.
DataTable dataTable2 = dataTable1.Copy()
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How to make the first option of selected with jQuery
...he "selected" flag from any options that might have already been selected. Now the answer is correct :)
– jmort253
Dec 8 '11 at 21:29
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Git workflow and rebase vs merge questions
I've been using Git now for a couple of months on a project with one other developer. I have several years of experience with SVN , so I guess I bring a lot of baggage to the relationship.
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Cast List to List
...uit.Add(new Banana());
// Eek - it's a banana!
Apple apple = apples[0];
Now you can convert a List<Apple> to an IEnumerable<IFruit> in .NET 4 / C# 4 due to covariance, but if you want a List<IFruit> you'd have to create a new list. For example:
// In .NET 4, using the covarianc...
How do I find out what version of WordPress is running?
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On the Admin Panel Dashboard, you can find a box called "Right Now". There you can see the version of the WordPress installation. I have seen this result in WordPress 3.2.1. You can also see this in version 3.7.1
UPDATE:
In WP Version 3.8.3
In WP Version 3.9.1 Admin Side, You can...
Best/Most Comprehensive API for Stocks/Financial Data [closed]
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Link is now dead
– QHarr
Oct 13 '18 at 8:41
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Overcoming “Display forbidden by X-Frame-Options”
...ks well in FF/Chrome/Opera but doesn't work in IE/Edge though. Anyone who knows something which will?
– Collector
Aug 18 '15 at 4:49
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