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What is the difference between association, aggregation and composition?
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For two objects, Foo and Bar the relationships can be defined
Association - I have a relationship with an object. Foo uses Bar
public class Foo {
void Baz(Bar bar) {
}
};
Composition - I own an object and I am ...
When and how should I use a ThreadLocal variable?
... avoid synchronizing access to that object (I'm looking at you, SimpleDateFormat). Instead, give each thread its own instance of the object.
For example:
public class Foo
{
// SimpleDateFormat is not thread-safe, so give one to each thread
private static final ThreadLocal<SimpleDateFor...
How to get rspec-2 to give the full trace associated with a test failure?
Right now if I run my test suite using rake spec I get an error:
6 Answers
6
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Reading specific lines only
I'm using a for loop to read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?
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node.js hash string?
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Take a look at crypto.createHash(algorithm)
var filename = process.argv[2];
var crypto = require('crypto');
var fs = require('fs');
var md5sum = crypto.createHash('md5');
var s = fs.ReadStream(filename);
s.on('data', function(d) {
md5sum.update(d);
});
s....
Catching error codes in a shell pipe
...til the first is known to be successful, then you probably need to use temporary files. The simple version of that is:
tmp=${TMPDIR:-/tmp}/mine.$$
if ./a > $tmp.1
then
if ./b <$tmp.1 >$tmp.2
then
if ./c <$tmp.2
then : OK
else echo "./c failed" 1>&...
What is a predicate in c#? [duplicate]
...nient way of basically testing if something is true of a given T object.
For example suppose I have a class:
class Person {
public string Name { get; set; }
public int Age { get; set; }
}
Now let's say I have a List<Person> people and I want to know if there's anyone named Oscar in...
Eclipse error: 'Failed to create the Java Virtual Machine'
I am getting this error message when I start Eclipse Helios on Windows 7:
41 Answers
4...
Turning multi-line string into single comma-separated
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You can use awk and sed:
awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'
Or if you want to use a pipe:
echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/'
To break it down:
awk is great at handling data broken down into fields
-vORS=, set...
How do I detect a click outside an element?
...g stopEventPropagation() is something that should be avoided as it breaks normal event flow in the DOM. See this article for more information. Consider using this method instead
Attach a click event to the document body which closes the window. Attach a separate click event to the container which ...