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Suppress warning “Category is implementing a method which will also be implemented by its primary cl
...in it. Ideally, singletons should be injected into code as a protocol, allowing you to switch out the implementation. But if you already have one embedded inside your code, you can add a category of the singleton in your unit test and overide the sharedInstance and the methods you what to control to...
Why does Java's hashCode() in String use 31 as a multiplier?
... subtract instruction. However, if your multiplier is slow this is still a win. Modern processors tend to have fast multipliers so it doesn't make much difference, so long as 32 goes on the correct side.
It's not a great hash algorithm, but it's good enough and better than the 1.0 code (and very mu...
How to get a vertical geom_vline to an x-axis of class date?
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on my machine (Win10 with R 3.2.2 and ggplot 1.0.1), I have to coerce the date to POSIXct to get it to align properly: as.POSIXct(as.Date(c("2016-12-01","2017-02-01")))
– Jthorpe
Jul 28 '17 at 17:36
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What Computer Science concepts should I know? [closed]
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Operating system concepts: Modern operating systems
People skills: How to win friends and influence people
Teamwork: Peopleware
User interface design: The inmates are running the asylum
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im...
Programmer Puzzle: Encoding a chess board state throughout a game
...s “all subsequent legal moves”. The problem also says nothing about knowing the moves up to this point. That’s actually a problem as I’ll explain.
Castling
The game has proceeded as follows:
e4 e5
Nf3 Nc6
Bb5 a6
Ba4 Bc5
The board looks as follows:
White has the option of castling...
Should a Netflix or Twitter-style web service use REST or SOAP? [closed]
... bigger picture. Talking about envelope bytes is like talking about loop unwinding when comparing a quick-sort to a shell-sort. There are scenarios where SOAP can perform better, and there are scenarios where REST can perform better. Context is everything.
REST gains much of its performance advanta...
Why is there no tuple comprehension in Python?
...es return a callable so if I only need to do it once I don't see much of a win vs just using tuple(obj[item] for item in items) directly. In my case I was embedding this into a list comprehension to make a list of tuple records. If I need to do this repeatedly throughout the code then itemgetter l...
PhpStorm wrap/surround selection?
...ng (word, condition) and press Cmd + Alt + T (on Mac) , Ctrl + Alt + T (on Windows). Available Surround With options dialog box will be displayed.
Update (for PhpStorm8)
For PhpStorm Version 8, tick on checkbox of Preferences -> Editor -> General -> Smart Keys -> Surround selection on ...
How can I get the current network interface throughput statistics on Linux/UNIX? [closed]
...ning to parse tcpdump output again. Thank you iftop and wireshark, for allowing me to be this lazy.
– Parthian Shot
Aug 4 '14 at 20:21
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Artificially create a connection timeout error
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The following URL always gives a timeout, and combines the best of @Alexander and @Emu's answers above:
http://example.com:81
Using example.com:81 is an improvement on Alexander's answer because example.com is reserved by the DNS st...