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What is the !! (not not) operator in JavaScript?
...bject is truthy
!![] === true // an (empty) array is truthy; PHP programmers beware!
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Alter MySQL table to add comments on columns
... information_schema.columns
WHERE
table_schema = 'my_database_name'
ORDER BY table_name , column_name
Export all to a CSV
Open it on your favorite csv editor
Note: You can improve to only one table if you prefer
The solution given by @Rufinus is great but if you have auto increments it wil...
How to implement a queue with three stacks?
...ic.
Let the elements queued into Q be numbered 1, 2, ..., based on their order of queue, with the first element that is queued into Q being defined as 1, the second one as 2, and so on.
Define
Q(0) := The state of Q when there are 0 elements in Q (and thus 0 elements in A, B and C)
Q(1) := The ...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...
Your NSSet approach is the best if you're not worried about the order of the objects, but then again, if you're not worried about the order, then why aren't you storing them in an NSSet to begin with?
I wrote the answer below in 2009; in 2011, Apple added NSOrderedSet to iOS 5 and Mac OS...
How to find the operating system version using JavaScript?
...y for Opera Next (en.wikipedia.org/wiki/…). It is detected as Chrome. In order to check for it, get index of 'OPR' in user agent.
– Eadel
Oct 29 '14 at 8:35
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What does $_ mean in PowerShell?
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Should I use Vagrant or Docker for creating an isolated environment? [closed]
... same file system.
You can use Dockerfile with the docker build command in order to handle the provisioning and configuration of your container. You have an example at docs.docker.com on how to make your Dockerfile; it is very intuitive.
The only reason you could want to use Vagrant is if you need ...
I want to use CASE statement to update some records in sql server 2005
... [dbo].[ProductionQueueProcessAutoclaveNominals]
WHERE
[QueueId] = 3
ORDER BY
[BaseDimensionId], [ElastomerTypeId], [Id];
---- (403 row(s) affected)
UPDATE [dbo].[ProductionQueueProcessAutoclaveNominals]
SET
[CycleId] = X.[CycleId]
FROM
[dbo].[ProductionQueueProcessAutoclaveNomi...
phpcms标签向导有什么用？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，按ID倒序排列，调取5条
{pc:content action="lists" catid="12" order="id DESC" thumb="" moreinfo="1" num="5" }
{loop $data $n $r}
<li><a href="{$r['url']}" title="{$r['title']}">{$r['title']}</a></li>
{/loop}
{/pc}
2、以SQL方式，从数据源1014_website,调取最新的5条新...
“Eliminate render-blocking CSS in above-the-fold content”
...elped me to get rid of "Render Blocking CSS". I used the following code in order to remove "Render Blocking CSS". Now in google page speed insight I am not getting issue related with render blocking css.
<!-- loadCSS -->
<script src="https://cdn.rawgit.com/filamentgroup/loadCSS/6b637fe0/sr...