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How to test if list element exists?

... This is actually a bit trickier than you'd think. Since a list can actually (with some effort) contain NULL elements, it might not be enough to check is.null(foo$a). A more stringent test might be to check that the name is actually defin...
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PHP date yesterday [duplicate]

...bit more obvious when scanning through the code. Self-documenting code and all that. – Justin ᚅᚔᚈᚄᚒᚔ Jul 22 '11 at 22:48 add a comment  |  ...
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Cannot use Server.MapPath

... First of all your project needs to reference System.Web.dll and it will work – ihebiheb Jul 12 '16 at 14:38 ...
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How can I check if a scrollbar is visible?

...s been shrunk by the horizontal scroll bar height. – Ally Jul 3 '12 at 10:36 why you have defined same function two ti...
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Browser support for URLs beginning with double slash

... This is an old post, but I also wanted to say it's not a good practice at all. Recently I had some trouble on one of our customers admin dashboard. The URL //code.jquery.com/jquery-2.1.3.min.js was not found and the library not loaded. I then try to load http://code.jquery.com/jquery-2.1.3.min.js a...
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Reset keys of array elements in php?

... To reset the keys of all arrays in an array: $arr = array_map('array_values', $arr); In case you just want to reset first-level array keys, use array_values() without array_map. ...
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How to set the style -webkit-transform dynamically using JavaScript?

... change the -webkit-transform: rotate() property using JavaScript dynamically, but the commonly used setAttribute is not working: ...
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Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat

....+' } (where the second compile statement indicates what version you actually want) That should clear matters up, as you will see if you run the dependency report again: compile - Classpath for compiling the main sources. +--- com.commonsware.cwac:camera-v9:0.5.4 | +--- com.actionbarsherlock:...
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sqlite3-ruby install error on Ubuntu

I have the following error during sqlite3-ruby install: 19 Answers 19 ...
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how do I query sql for a latest record date for each user

... row number of 1, so the results may be inconsistent. But as long as you really don't care, then this shouldn't be a problem. This can be solved if you add the PK after the date. For example: order by date desc, id desc). – Andrew Apr 26 '19 at 21:40 ...