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What is an idempotent operation?
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In computing, an idempotent operation is one that has no additional effect if it is called more than once with the same input parameters. For example, removing an item from a set can be considered an idempotent operation on the set.
In mathematics, an idempotent op...
How to make a flat list out of list of lists?
...the previous intermediate result must be copied over (as well as a few new ones added at the end). So, for simplicity and without actual loss of generality, say you have L sublists of I items each: the first I items are copied back and forth L-1 times, the second I items L-2 times, and so on; total ...
What is AppDomain? [duplicate]
...pain is you need to use remoting etc.
See MSDN for lots more info. To be honest, it isn't something you need to mess with very often.
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Who is listening on a given TCP port on Mac OS X?
...e just IPv4:
lsof -nP -i4TCP:$PORT | grep LISTEN
On older versions, use one of the following forms:
lsof -nP -iTCP:$PORT | grep LISTEN
lsof -nP -i:$PORT | grep LISTEN
Substitute $PORT with the port number or a comma-separated list of port numbers.
Prepend sudo (followed by a space) if you nee...
Why fragments, and when to use fragments instead of activities?
...using includes). However; fragments are wired in to the Android API, from HoneyComb, and up. Let me elaborate;
The ActionBar. If you want tabs up there to navigate your app, you quickly see that ActionBar.TabListener interface gives you a FragmentTransaction as an input argument to the onTabSelect...
Hyphen, underscore, or camelCase as word delimiter in URIs?
...ed
See how Chrome (I hear Google makes a search engine too) only thinks one of those is two words?
camelCase and underscore also require the user to use the shift key, whereas hyphenated does not.
So if you should use hyphens in a crawlable web application, why would you bother doing something...
Merge (with squash) all changes from another branch as a single commit
In Git, is there a way to merge all changes from one branch into another, but squash to a single commit at the same time?
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Swapping two variable value without using third variable
One of the very tricky questions asked in an interview.
27 Answers
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php：获取数组第一个值 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...回 FALSE。
例 1. reset() 例子
01 <?php
02 $array = array('step one', 'step two', 'step three', 'step four');
03 // by default, the pointer is on the first element
04 echo current($array) . "<br />\n"; // "step one"
05 // skip two steps
06 next($array);
07 next($array);
08 echo curren...
Creating a range of dates in Python
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This does not work if you use timezone aware datetimes and there is a shift of DST!!! I mean, when you use a start and end date and fill it up in between this way...
– gabn88
Jul 30 '15 at 9:22
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