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How to check the extension of a filename in a bash script?
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If you want to specify an inequality, remember to include extra brackets: if [[ ${file: -4} != ".txt" ]]
– Ram Rajamony
Jul 20 '13 at 23:38
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How to validate an email address using a regular expression?
...sistent with the RFC 5322 grammar and passes several tests using grep -Po, including cases domain names, IP addresses, bad ones, and account names with and without quotes.
Correcting the 00 bug in the IP pattern, we obtain a working and fairly fast regex. (Scrape the rendered version, not the mark...
What is this Javascript “require”?
...in other languages with minor differences in syntax and behavior, like C's include, Python's import, and so on.
One big difference between Node.js modules and browser JavaScript is how one script's code is accessed from another script's code.
In browser JavaScript, scripts are added via the <s...
What does enumerable mean?
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An enumerable property is one that can be included in and visited during for..in loops (or a similar iteration of properties, like Object.keys()).
If a property isn't identified as enumerable, the loop will ignore that it's within the object.
var obj = { key: 'val'...
Why does C++ compilation take so long?
...er has to be compiled multiple times
(once for every compilation unit that includes it).
Linking
Once compiled, all the object files have to be linked together.
This is basically a monolithic process that can't very well be parallelized, and has to process your entire project.
Parsing
The synt...
Difference between System.DateTime.Now and System.DateTime.Today
...ts a date without a time. You can get the current date for any time zone, including the local system time zone:
using NodaTime;
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Instant now = SystemClock.Instance.Now;
DateTimeZone zone1 = DateTimeZoneProviders.Tzdb.GetSystemDefault();
LocalDate todayInTheSystemZone = now.InZone(zone1).Date;...
What are WSGI and CGI in plain English?
...f is merely a specification and can be implemented in many different ways, including on top of CGI.
– Graham Dumpleton
Feb 8 '11 at 7:39
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A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
...urchase library RMStore. I will explain how to verify a transaction, which includes verifying the whole receipt.
At a glance
Get the receipt and verify the transaction. If it fails, refresh the receipt and try again. This makes the verification process asynchronous as refreshing the receipt is asy...
Why is using the rails default_scope often recommend against?
...out the user_id).
Now we want to get the list of all posts - unpublished included - say for the logged in user's view. You'll realise you have to 'overwrite' or 'undo' the effect of default_scope. After a quick google, you'll likely find out about unscoped. See what happens next:
2.1.1 :002 >...
Is there a visual profiler for Python? [closed]
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KCacheGrind includes a version called QCacheGrind which does run on Mac OS X and on Windows.
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