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Look up all descendants of a class in Ruby
...That works great, thanks! I suppose visiting every class might be too slow if you're trying to shave milliseconds, but it's perfectly speedy for me.
– Douglas Squirrel
Mar 6 '10 at 20:01
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How to create a bash script to check the SSH connection?
...ou'll have to grep the message (nmap does not use the return-value to show if a port was filtered, closed or open).
EDIT2:
If you're interested in the actual state of the ssh-port, you can substitute grep open with egrep 'open|closed|filtered':
$ nmap host -PN -p ssh | egrep 'open|closed|filtered...
Removing duplicate objects with Underscore for Javascript
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The "'_.pluck' callback shorthand" only works if you pass a value for isSorted (e.g. _.uniq(a, false, 'a')) I pinged github/bestiejs/lodash and they said the issue was fixed on edge. So if you're not using a function, make sure you have the latest. This may not be an is...
How do I implement interfaces in python?
... Pythons Abstract Base Classes, introduced in Python 2.6. They are useful, if you want to make base classes that cannot be instantiated, but provide a specific interface or part of an implementation.
Another usage is if you somehow want to specify that an object implements a specific interface, and...
MySQL Data - Best way to implement paging?
...hen using prepared statements).
With two arguments, the first argument specifies the offset of the first row to return, and the second specifies the maximum number of rows to return. The offset of the initial row is 0 (not 1):
SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15
To retrieve all rows...
Easiest way to detect Internet connection on iOS?
...rry background, making requests through HTTPUrlConnection instantly fail if there is no connection available. This seems like completely sane behavior, and I was surprised to find NSURLConnection in iOS did not emulate it.
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Proper usage of Optional.ifPresent()
I am trying to understand the ifPresent() method of the Optional API in Java 8.
5 Answers
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How to restart Activity in Android
...ivity.recreate() is the way to go in API 11 and beyond. This is preferable if you're in an API11+ environment. You can still check the current version and call the code snippet above if you're in API 10 or below. (Please don't forget to upvote Ralf's answer!)
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Understanding the Use of ColorMatrix and ColorMatrixColorFilter to Modify a Drawable's Hue
...op, where the graphic retains its transparency and luminosity, and only modifies the color of the image. For example:
becomes After doing some research, it appears that the ColorMatrixColorFilter class may do what I need, but I can't seem to find any resources pointing to how the matrix is...
Why use HttpClient for Synchronous Connection
...tivity, but what I am doing is purely synchronous, so I cannot see any significant benefit over using HttpWebRequest .
5 A...