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Easy idiomatic way to define Ordering for a simple case class
...tring, load:Int)
object A {
val lexicographicalOrdering = Ordering.by { foo: A =>
foo.tag
}
val loadOrdering = Ordering.by { foo: A =>
foo.load
}
}
implicit val ord = A.lexicographicalOrdering
val l = List(A("words",1), A("article",2), A("lines",3)).sorted
// List(A(art...
Sass calculate percent minus px
...need to use calc() instead. Check browser compatibility on Can I use...
.foo {
height: calc(25% - 5px);
}
If your values are in variables, you may need to use interpolation turn them into strings (otherwise Sass just tries to perform arithmetic):
$a: 25%;
$b: 5px;
.foo {
width: calc(#{$a...
jQuery equivalent of JavaScript's addEventListener method
...losest thing would be the bind function:
http://api.jquery.com/bind/
$('#foo').bind('click', function() {
alert('User clicked on "foo."');
});
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How to reset sequence in postgres and fill id column with new data?
...
ALTER SEQUENCE seq RESTART;
Then update the table's ID column:
UPDATE foo SET id = DEFAULT;
Source: PostgreSQL Docs
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Is there a zip-like function that pads to longest length in Python?
...ue parameter:
>>> list(itertools.zip_longest(a, b, c, fillvalue='foo'))
[('a1', 'b1', 'c1'), ('foo', 'b2', 'c2'), ('foo', 'b3', 'foo')]
With Python 2 you can either use itertools.izip_longest (Python 2.6+), or you can use map with None. It is a little known feature of map (but map change...
Better to 'try' something and catch the exception or test if it's possible first to avoid an excepti
... a directory exists, do not do this:
import os, sys
if not os.path.isdir('foo'):
try:
os.mkdir('foo')
except OSError, e
print e
sys.exit(1)
If another thread or process creates the directory between isdir and mkdir, you'll exit. Instead, do this:
import os, sys, errno
try:
os....
How to retrieve a user environment variable in CMake (Windows)
...ke script
You can pass a variable on the line with the cmake invocation:
FOO=1 cmake
or by exporting a variable in BASH:
export FOO=1
Then you can pick it up in a cmake script using:
$ENV{FOO}
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Equivalent of typedef in C#
...nheriting from the class and creating its constructors. E.g.
public class FooList : List<Foo> { ... }
Not the best solution (unless your assembly gets used by other people), but it works.
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Assigning out/ref parameters in Moq
...rn true, and the out argument will return "ack", lazy evaluated
mock.Setup(foo => foo.TryParse("ping", out outString)).Returns(true);
// ref arguments
var instance = new Bar();
// Only matches if the ref argument to the invocation is the same instance
mock.Setup(foo => foo.Submit(ref instanc...
When to choose checked and unchecked exceptions
...ign of exceptions, which the mechanism I described would solve, is that if foo is documented as throwing barException when reading past the end of a file, and foo calls a method which throws barException even though foo isn't expecting it to, the code which calls foo will think the end of the file w...