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What is tail call optimization?
...ve functions, reuse the stackframe as-is.
The tail-call optimization transforms our recursive code into
unsigned fac_tailrec(unsigned acc, unsigned n)
{
TOP:
if (n < 2) return acc;
acc = n * acc;
n = n - 1;
goto TOP;
}
This can be inlined into fac() and we arrive at
unsigned ...
Concatenate two slices in Go
...
Is this at all performant when the slices are quite big? Or does the compiler not really pass all the elements as parameters?
– Toad
Sep 24 '14 at 8:57
...
Is there any way to use a numeric type as an object key?
...operty Descriptor. Values of the Property Identifier type are pairs of the form (name, descriptor), where name is a String and descriptor is a Property Descriptor value.
However, I don't see a definite specification for it in ECMA-262-3.
Regardless, I wouldn't attempt to use non-strings as propert...
Bash: Syntax error: redirection unexpected
...installer)
However, according to this issue, it was solved:
The exec form makes it possible to avoid shell string munging, and
to RUN commands using a base image that does not contain /bin/sh.
Note
To use a different shell, other than /bin/sh, use the exec form
passing in the de...
Generate pdf from HTML in div using Javascript
... time.
One very important thing to add is that you lose all your style information (CSS). Luckily jsPDF is able to nicely format h1, h2, h3 etc., which was enough for my purposes. Additionally it will only print text within text nodes, which means that it will not print the values of textareas and...
Interface vs Base class
... benchmarking a tad difficult.) If you're trying to optimize something performance sensitive, and only then, you should consider this.
– Philip Guin
Feb 22 '14 at 22:59
...
Concatenating two one-dimensional NumPy arrays
...
An alternative ist to use the short form of "concatenate" which is either "r_[...]" or "c_[...]" as shown in the example code beneath (see http://wiki.scipy.org/NumPy_for_Matlab_Users for additional information):
%pylab
vector_a = r_[0.:10.] #short form of "ar...
CURL to access a page that requires a login from a different page
...
The web site likely uses cookies to store your session information. When you run
curl --user user:pass https://xyz.com/a #works ok
curl https://xyz.com/b #doesn't work
curl is run twice, in two separate sessions. Thus when the second command runs, the cookies set by the 1st com...
Automatic post-registration user authentication
... $user = //Handle getting or creating the user entity likely with a posted form
$token = new UsernamePasswordToken($user, null, 'main', $user->getRoles());
$this->container->get('security.token_storage')->setToken($token);
$this->container->get('session')-&g...
Options for HTML scraping? [closed]
...ions (like HTMLSQL), but it's very flexible. It lets you maniuplate poorly formed HTML as if it were well formed XML, so you can use XPATH or just itereate over nodes.
http://www.codeplex.com/htmlagilitypack
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