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What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
I am a beginner to Ruby on Rails and I am using Rails 3.0.9.
3 Answers
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Equivalent C++ to Python generator pattern
...an iterator.
P.S. See also this article which mentions both a switch hack by Christopher M. Kohlhoff and Boost.Coroutine by Oliver Kowalke. Oliver Kowalke's work is a followup on Boost.Coroutine by Giovanni P. Deretta.
P.S. I think you can also write a kind of generator with lambdas:
std::functio...
Differences between Agda and Idris
... The latter is equivalent to a statement that the types are equal followed by one about the values. In a world where type equality is weird (HoTT) then heteq is a weirder statement.
– Mysterious Dan
Jan 9 '14 at 21:37
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Python : List of dict, if exists increment a dict value, if not append a new dict
...ready-to-use class: containers.Counter You just create a Counter instance by calling the class, passing in any iterable; it builds a dictionary where the keys are values from the iterable, and the values are counts of how many times the key appeared in the iterable. The above example then becomes:...
How do I expire a PHP session after 30 minutes?
...You should implement a session timeout of your own. Both options mentioned by others (session.gc_maxlifetime and session.cookie_lifetime) are not reliable. I'll explain the reasons for that.
First:
session.gc_maxlifetime
session.gc_maxlifetime specifies the number of seconds after which data ...
How to identify server IP address in PHP
...alls the server, which is under control of the remote user. Use the answer by John K instead
– Ariel
Feb 12 '15 at 10:36
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IntelliJ IDEA shows errors when using Spring's @Autowired annotation
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I had the same problem with IntelliJ IDEA 13.1.4
I solved it by removing the Spring facet (File->Project Structure) and leaving it to just show "Detection".
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Casting vs using the 'as' keyword in the CLR
...variables possible in every scope, you might still want to use is followed by a cast.
I don't think any of the answers so far (at the time of starting this answer!) have really explained where it's worth using which.
Don't do this:
// Bad code - checks type twice for no reason
if (randomObject...
How do I create a pylintrc file
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.pylintrc in a project directory also gets picked up by default if pylintrc does not exist. pylint.pycqa.org/en/latest/user_guide/…
– Taylor Edmiston
Apr 10 '19 at 20:14
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A gentle tutorial to Emacs/Swank/Paredit for Clojure
...- a buffer will pop up with information on the current major mode followed by information on all active minor modes (paredit is one of those).
Update: I've just found this cool set of notes on Paredit by Phil Hagelberg... That's a link to a text file, I remember seeing a nice set of slides with thi...