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Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
I am trying to determine the best time efficient algorithm to accomplish the task described below.
16 Answers
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Check whether a string is not null and not empty
...t get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available since Java SE 1.6. You have to check str.length() == 0 on previous versions.
To ignore whitespace as well:
if(str != null && !str.trim().isEmpty())
(since Java 11 str.trim().isEmpty() can be ...
Are trailing commas in arrays and objects part of the spec?
...ECMAScript 3
Section 11.1.5 in the ECMAScript 5 specification:
ObjectLiteral :
{ }
{ PropertyNameAndValueList }
{ PropertyNameAndValueList , }
So yes, it is part of the specification.
Update: Apparently this is new in ES5. In ES3 (page 41), the definition was just:
ObjectLitera...
How do I prevent the modification of a private field in a class?
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but do make sure it's a deep copy, not a shallow copy, of the data. For Strings it makes no difference, for other classes like Date where the content of the instance can be modified it can make a difference.
– jwenting
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What is the purpose of the reader monad?
... reader monad is actually not so complicated, and has real easy-to-use utility.
There are two ways of approaching a monad: we can ask
What does the monad do? What operations is it equipped with? What is it good for?
How is the monad implemented? From where does it arise?
From the first appro...
ipad safari: disable scrolling, and bounce effect?
...pdate September 2014:
A more thorough approach can be found here: https://github.com/luster-io/prevent-overscroll. For that and a whole lot of useful webapp advice, see http://www.luster.io/blog/9-29-14-mobile-web-checklist.html
Update March 2016: That last link is no longer active - see https://we...
How to place the ~/.composer/vendor/bin directory in your PATH?
...ethod in the quickstart documentation, that is, via Laravel Installer, but it says to "Make sure to place the ~/.composer/vendor/bin directory in your PATH so the Laravel executable is found when you run the Laravel command in your terminal." so my question is, how do I do that? This may be a si...
Algorithm to detect overlapping periods [duplicate]
...n end date.
I need to detect if my first time period (A) is overlapping with another one(B/C).
In my case, if the start of B is equal to the end of A, they are not overlapping(the inverse too)
I found the following cases:
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Rails 4: assets not loading in production
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config.assets.precompile = ['*.js', '*.css', '*.css.erb']
This works with me. use following command to pre-compile assets
RAILS_ENV=production bundle exec rake assets:precompile
Best of luck!
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Need to handle uncaught exception and send log file
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Here's the complete solution (almost: I omitted the UI layout and button handling) - derived from a lot of experimentation and various posts from others related to issues that came up along the way.
There are a number of things you need to do:
Handle uncaughtExc...