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JavaScript exponents
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Math.pow(base, exponent), for starters.
Example:
Math.pow(12, 2)
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efficient circular buffer?
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Based on MoonCactus's answer, here is a circularlist class. The difference with his version is that here c[0] will always give the oldest-appended element, c[-1] the latest-appended element, c[-2] the penultimate... This is ...
Where to define custom error types in Ruby and/or Rails?
...below, so that your validations will fail:
def MyModel < ActiveRecord::Base
validate :code_does_not_contain_hyphens
def code_does_not_contain_hyphens
errors.add(:code, "cannot contain hyphens") if code.include?("-")
end
end
When validations are run, this method will piggy-back onto ...
How to Add Stacktrace or debug Option when Building Android Studio Project
...e gradle command line flags from
File > Settings > Compiler (Gradle-based Android Project)
For MacOS user, it's here
Android Studio > Preferences > Build, Execution, Deployment > Compiler
like this (add --stacktrace or --debug)
(Note that the screenshot is from before 0.8.10...
How to Flatten a Multidimensional Array?
... [x] => X
[y] => Y
[p] => P
[q] => Q
)
Update: Based on comment by @MohamedGharib
This will throw an error if the outer array is empty, since array_merge would be called with zero arguments. It can be be avoided by adding an empty array as the first argument.
array_merg...
Choosing a Java Web Framework now? [closed]
...large website which is built on a custom developed mvc framework to a java based web framework which provides built-in support for ajax, rich media content, mashup, templates based layout, validation, maximum html/java code separation. Grails looked like a good choice, however, we do not want to use...
Can overridden methods differ in return type?
...ething that doesn't break "caller code".
In other words: assume that the base bar() is supposed to return int. Then a subclass could return short - but not long because callers will be fine dealing with a short value, but not a long!
...
Calculate text width with JavaScript
... fiddle compares this Canvas method to a variation of Bob Monteverde's DOM-based method, so you can analyze and compare accuracy of the results.
There are several advantages to this approach, including:
More concise and safer than the other (DOM-based) methods because it does not change global stat...
Unit testing of private methods [duplicate]
...ll going to be private, but now you can derive a "testing" class from your base class that exposes the private functionality you want tested.
Here's a minimal example:
class BASE_CLASS {
protected:
int your_method(int a, int b);
};
class TEST_CLASS : public BASE_CLASS {
public:
int yo...
See “real” commit date in github (hour/day)
... permanently without hovering (e.g. for screenshots), the above Javascript-based solutions do not match the latest Github HTML (see comments). And they did not take into account the fact that the timestamps are auto-updated based on a timer ("X minutes ago" has to change every minute), so they will ...