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Test if a command outputs an empty string
...er of maximally 1 character using head -c1(thanks to netj for posting this idea in the comments below)
compare that number with zero
So for example, instead of:
if [[ $(ls -A) ]]
I would use:
if [[ $(ls -A | wc -c) -ne 0 ]]
# or:
if [[ $(ls -A | head -c1 | wc -c) -ne 0 ]]
Instead of:
if [ ...
Learn C first before learning Objective-C [closed]
... you'll receive a very powerful team.
If you only learn Obj-C and have no idea of C or only know the very basics of it and never tried how elegantly it can solve some common problems, you actually learned only half of Obj-C. C is a fundamental part of Obj-C. The ability to use C at any time and eve...
Java compile speed vs Scala compile speed
...st has settled on 2.8. This page documents some of the ongoing efforts and ideas to improve the performance of the Scala compiler.
Martin Odersky provides much more detail in his answer.
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im...
Finding JavaScript memory leaks with Chrome
... the $0 function in the console, that was new to me - of course, I have no idea what that's doing or how you knew to use it ($1 seems useless while $2 seems to do the same thing). Secondly, how did you know to highlight the row #button in function cache() and not any of the other dozens of rows? Fin...
Why doesn't Ruby support i++ or i-- (increment/decrement operators)?
...10, Aleksi Niemelä <aleksi.niemela@cinnober.com> writes:
|I got an idea from http://www.pragprog.com:8080/rubyfaq/rubyfaq-5.html#ss5.3
|and thought to try. I didn't manage to make "auto(in|de)crement" working so
|could somebody help here? Does this contain some errors or is the idea
|wrong?
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Open a project in a new window in IntelliJ after “accidentally” clicking remember decision
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In IDEA 14 and IDEA 15, this can be found in Settings | Appearance & Behavior | System Settings -> Project Opening.
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java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has
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@BalusC Do you have an idea on this related problem? stackoverflow.com/questions/18658021/…
– confile
Sep 14 '13 at 21:42
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Builder Pattern in Effective Java
... have recently started to read Effective Java by Joshua Bloch. I found the idea of the Builder pattern [Item 2 in the book] really interesting. I tried to implement it in my project but there were compilation errors. Following is in essence what I was trying to do:
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Invalidating JSON Web Tokens
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I too have been researching this question, and while none of the ideas below are complete solutions, they might help others rule out ideas, or provide further ones.
1) Simply remove the token from the client
Obviously this does nothing for server side security, but it does stop an attacker...
How do you rename a Git tag?
...er to "How can I do it?". The user wasn't asking if you think it is a good idea to do that or if people will like that. If someone asks "How can I cut off my hand", either tell him how it's done or leave him alone but he won't need someone telling him that cutting of a hand may not be such a great i...