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How to check if array is empty or does not exist? [duplicate]

... out that my original answer, more than anything else, addressed the wrong order of the conditions being evaluated in the question. In this sense, it fails to address several scenarios, such as null values, other types of objects with a length property, etc. It is also not very idiomatic JavaScript....
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How do I implement onchange of with jQuery?

....log("someattr: " + dataAttribute ); }); I recommend use this keyword in order to get access to the entire element so your are able do everything you need with this element. share | improve this a...
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Returning IEnumerable vs. IQueryable

... This is very useful information in order to understand the difference, but the top answer is more accurate as the question was "when should one be preferred over the other?", and not "what is the difference?". – Scopperloit ...
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Fixing “Lock wait timeout exceeded; try restarting transaction” for a 'stuck" Mysql table?

...running transactions with SELECT * FROM `information_schema`.`innodb_trx` ORDER BY `trx_started` Your transaction should be one of the first, because it's the oldest in the list. Now just take the value from trx_mysql_thread_id and send it the KILL command: KILL 1234; If you're unsure which tr...
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When is an interface with a default method initialized?

...so perhaps the fix is something other than "restore the old initialization order." – Stuart Marks May 29 '15 at 0:11  |  show 3 more comments ...
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How do you migrate an IIS 7 site to another server?

.... The applicationHost.config has a lot more differences. Some entries are ordered differently, but otherwise identical, so you will have to pick through each difference and figure it out. I put my 7.5 export files in the System32\inetsrv\config\Export folder prior to merging. I merged FROM folder...
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What's the difference between the various methods to get a Context?

... repeat this cycle many times) - what context should I use in this case in order to avoid building up a huge trail of referenced contexts? Diana says using 'this' rather than getBaseContext, but then... most of the times A will be reused but there are situations when a new object for A will be creat...
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Download attachments using Java Mail

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How do I open an old MVC project in Visual Studio 2012 or Visual Studio 2013?

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Defining and using a variable in batch file

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