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How can I output UTF-8 from Perl?
...ore or less in utf8, will be output as latin1 by default. This way scripts from a pre-unicode era still work the same, even with a unicode-aware perl.
– mirod
Mar 10 '09 at 10:00
3...
Why must wait() always be in synchronized block
...s true:
You can get spurious wakeups (meaning that a thread can wake up from waiting without ever having received a notification), or
The condition can get set, but a third thread makes the condition false again by the time the waiting thread wakes up (and reacquires the monitor).
To deal wit...
How to play with Control.Monad.Writer in haskell?
...t has logging capabilities, but also does something else - say it can read from an environment too. You'd implement this as
type RW r w a = ReaderT r (Writer w a)
Now because the writer is inside the ReaderT monad transformer, if you want to log output you can't use tell w (because that only oper...
Eclipse error: 'Failed to create the Java Virtual Machine'
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in eclipse.ini, changing reducing -Xmx to 512m from 1024 fixed the issue for me. The system was having 1GB RAM.
– Dexter
Jul 17 '14 at 9:26
3
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Check whether a string is not null and not empty
... && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available since Java SE 1.6. You have to check str.length() == 0 on previous versions.
To ignore whitespace as well:
if(str != null && !str.trim().isEmpty())
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Sorting multiple keys with Unix sort
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From the sort man page: "POS is F[.C][OPTS], where F is the field number and C the character position in the field; both are origin 1." See man page for full documentation.
– Adam Rosenfield
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How can you encode a string to Base64 in JavaScript?
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You can use btoa() and atob() to convert to and from base64 encoding.
There appears to be some confusion in the comments regarding what these functions accept/return, so…
btoa() accepts a “string” where each character represents an 8-bit byte – if you pass a str...
Why should I use Hamcrest-Matcher and assertThat() instead of traditional assertXXX()-Methods
...easier to read, but once the assert fails, you'll get a good error message from assertThat, but only a very minimal amount of information from assertTrue.
assertThat will tell you what the assertion was and what you got instead. assertTrue will only tell you that you got false where you expected tr...
Why use strict and warnings?
...y, It would be better if we go into details, which I am specifiying below
From perl.com (my favourite):
use strict 'vars';
which means that you must always declare variables before you use them.
If you don't declare you will probably get error message for the undeclared variable
Global sy...
What are the best practices for structuring a large Meteor app with many HTML template files? [close
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Lump it all together! From the docs:
> HTML files in a Meteor application are treated quite a bit differently
> from a server-side framework. Meteor scans all the HTML files in your
> directory for three top-level elements: <head>,...