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How to return a part of an array in Ruby?
...turns a subarray specified by range. Negative indices count
backward from the end of the array (-1 is the last element).
Returns nil if the index (or starting index) are out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] ...
Reset the database (purge all), then seed a database
...verything and recreate database + seeds with both:
rake db:reset: loads from schema.rb
rake db:drop db:create db:migrate db:seed: loads from migrations
Make sure you have no connections to db (rails server, sql client..) or the db won't drop.
schema.rb is a snapshot of the current state of you...
Can you “compile” PHP code and upload a binary-ish file, which will just be run by the byte code int
...r
GitHub (download), Wikipedia
compiles to .NET (CIL) looks discontinued from July 2017 and doesn't seem to support PHP 7.
phc
compiles to native binaries
not very active now (February 2014) – last version in 2011, last change in summer 2013
Roadsend PHP Compiler
GitHub, GitHub of a rew...
A fast method to round a double to a 32-bit int explained
...,740,992 the representable numbers are exactly the integers
This follows from the fact that the mantissa is 52 bits wide.
The other interesting fact about adding 251+252 is that it affects the mantissa only in the two highest bits - which are discarded anyway, since we are taking only its lowest ...
Refresh a page using PHP
...n the screen, like stock prices, but not use that information in a form or from javascript, perhaps use an iframe tag pointing to a page with just the information being updated, and with a delay appropriate to how current the information must be.
– Patanjali
Oc...
How to convert byte array to string [duplicate]
...
This is wrong. From the code in the question, the encoding is UTF8, the default for BinaryWriter.
– Tom Blodget
Feb 13 '16 at 2:19
...
How do I import the Django DoesNotExist exception?
... - before it is passed to assertRaises. You need to separate the arguments from the callable, as described in the unittest documentation:
self.assertRaises(Answer.DoesNotExist, Answer.objects.get, body__exact='<p>User can reply to discussion.</p>')
or better:
with self.assertRaises(A...
How can I measure the speed of code written in PHP? [closed]
...names
(Read the documentation for more informations)
This screenshot is from a C++ program in KcacheGrind :
(source: sourceforge.net)
You'll get exactly the same kind of thing with PHP scripts ;-)
(With KCacheGrind, I mean ; WinCacheGrind is not as good as KCacheGrind...)
This allows you to get...
Get the closest number out of an array
I have a number from minus 1000 to plus 1000 and I have an array with numbers in it. Like this:
20 Answers
...
How to convert Nonetype to int or string?
... figure out how you're getting None when you expect a number and stop that from happening.
If it's someone else's code, find out the conditions under which it gives None and determine a sensible value to use for that, with the usual conditional code:
result = could_return_none(x)
if result is Non...