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How to optimize for-comprehensions and loops in Scala?
...t tail-recursive functions are also as fast as while loops (since both are converted to very similar or identical bytecode).
– Rex Kerr
May 27 '11 at 2:03
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Find region from within an EC2 instance
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ec2-metadata --availability-zone | sed 's/.$//'
For debian based systems, the command is without dash.
ec2metadata --availability-zone | sed 's/.$//'
share
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improve this answer
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How do I initialize a byte array in Java?
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Using a function converting an hexa string to byte[], you could do
byte[] CDRIVES = hexStringToByteArray("e04fd020ea3a6910a2d808002b30309d");
I'd suggest you use the function defined by Dave L in Convert a string representation of a hex d...
When is it better to use String.Format vs string concatenation?
...ng etc. religiously. However, after reading your (old) article, I am now a convert. Thanks
– stevethethread
Jan 21 '14 at 14:42
3
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What's the advantage of a Java enum versus a class with public static final fields?
...ly assign an enum element a certain value, and consequently the ability to convert an integer to an enum without a decent amount of effort (i.e. Convert integer value to matching Java Enum ).
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How to set my default shell on Mac?
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dbright@PowerMac:~$ chsh -s /Users/dbright/sys/bin/bash Changing shell for dbright. Password for dbright: chsh: /Users/dbright/sys/bin/bash: non-standard shell dbright@PowerMac:~$ ls -l /etc/shells -rw-r--r-- 1 root wheel 179 Sep 23 2007 /etc/shells
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How can I iterate through the unicode codepoints of a Java String?
... add a workaround method that works with foreach loops (ref), plus you can convert it to java 8's new String#codePoints method easily when you move to java 8:
You can use it with foreach like this:
for(int codePoint : codePoints(myString)) {
....
}
Here's the helper mthod:
public static It...
What's the meaning of interface{}?
...unction, the Go runtime will perform a type conversion (if necessary), and convert the value to an interface{} value.
All values have exactly one type at runtime, and v's one static type is interface{}.
An interface value is constructed of two words of data:
one word is used to point...
How can I check the syntax of Python script without executing it?
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import sys
filename = sys.argv[1]
source = open(filename, 'r').read() + '\n'
compile(source, filename, 'exec')
Save this as checker.py and run python checker.py yourpyfile.py.
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Extreme wait-time when taking a SQL Server database offline
... (a rare example: asynchronous statistic update)
To find connections, use sys.sysprocesses
USE master
SELECT * FROM sys.sysprocesses WHERE dbid = DB_ID('MyDB')
To force disconnections, use ROLLBACK IMMEDIATE
USE master
ALTER DATABASE MyDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE
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