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Difference between Array and List in scala
... is that arrays are nonvariant and lists are covariant. But what about performance and some other characteristics?
3 Answe...
Difference between volatile and synchronized in Java
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It's important to understand that there are two aspects to thread safety.
execution control, and
memory visibility
The first has to do with controlling when code executes (including the order in which instructions are executed)...
When exactly is it leak safe to use (anonymous) inner classes?
I have been reading some articles on memory leaks in Android and watched this interesting video from Google I/O on the subject .
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How to test if a string is JSON or not?
...JAX call, and the server will return either a JSON string with useful data or an error message string produced by the PHP function mysql_error() . How can I test whether this data is a JSON string or the error message.
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Perform an action in every sub-directory using Bash
I am working on a script that needs to perform an action in every sub-directory of a specific folder.
9 Answers
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What is an undefined reference/unresolved external symbol error and how do I fix it?
What are undefined reference/unresolved external symbol errors? What are common causes and how to fix/prevent them?
34 Answ...
What are the pros and cons of performing calculations in sql vs. in your application
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It depends on a lot of factors - but most crucially:
complexity of calculations (prefer doing complex crunching on an app-server, since that scales out; rather than a db server, which scales up)
volume of data (if you need to access/aggregate a lot o...
How do short URLs services work?
How do services like TinyURL or Metamark work?
Do they simply associate the tiny URL key with a [virtual?] web page which merely provide an "HTTP redirect" to the original URL? or is there more "magic" to it ?
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Sending websocket ping/pong frame from browser
...methods on a javascript WebSocket object in chrome related to ping-pong). Or is it just a design pattern (e.g. I literally send "ping" or any other string to the server and have it respond). Is ping-pong at all related to continuation frames?
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Redirect all output to file [duplicate]
... to redirect output from the screen to a file, I can either use the > or tee . However, I'm not sure why part of the output is still output to the screen and not written to the file.
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