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Is there a way to detect if a browser window is not currently active?
I have JavaScript that is doing activity periodically. When the user is not looking at the site (i.e., the window or tab does not have focus), it'd be nice to not run.
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Why is there no SortedList in Java?
...he SortedSet and SortedMap interfaces. Both belong to the Java Collections framework and provide a sorted way to access the elements.
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Best way to compare two complex objects
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Implement IEquatable<T> (typically in conjunction with overriding the inherited Object.Equals and Object.GetHashCode methods) on all your custom types. In the case of composite types, invoke the contained types’ Equals method within the containing types. For contained ...
Running PostgreSQL in memory only
...hile this can be done, I'd recommend to have a dedicated Postgres installation where you simply recreate your test database before running your tests.
You can re-create the test-database by using a template database which makes creating it quite fast (a lot faster than running initdb for each test...
How can I use redis with Django?
...AM cache. It supports basic GET and SET of keys plus the storing of collections such as dictionaries. You can cache RDBMS queries by storing their output in Redis. The goal would be to speed up your Django site. Don't start using Redis or any other cache until you need the speed - don't prematurely ...
When to use dynamic vs. static libraries
...he size of the code in your binary. They're always loaded and whatever version of the code you compiled with is the version of the code that will run.
Dynamic libraries are stored and versioned separately. It's possible for a version of the dynamic library to be loaded that wasn't the original one ...
What is the difference between Amazon SNS and Amazon SQS?
...coupling SNS with SQS. You may not want an external service to make connections to your hosts (firewall may block all incoming connections to your host from outside). Your end point may just die because of heavy volume of messages. Email and SMS maybe not your choice of processing messages quickly. ...
UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?
...art of the view every time the user gets to view it, e.g. the iPod application scrolls the lyrics back to the top every time you go to the "Now Playing" view.
However, when you are loading things from a server, you also have to think about latency. If you pack all of your network communication into...
How to post pictures to instagram using API
I am building a php application which needs to post the user uploaded picture directly to Instagram, but after a quick search i found that there is no such function in the API :( and it feels weird... because they should provide one. I am not sure if there is any other way (except the apps for andro...
In pure functional languages, is there an algorithm to get the inverse function?
In pure functional languages like Haskell, is there an algorithm to get the inverse of a function, (edit) when it is bijective? And is there a specific way to program your function so it is?
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