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How do I get the opposite (negation) of a Boolean in Python?
...0])
>>> np.logical_not(arr)
array([ True, False, False, True])
Customizing your own classes
not works by calling bool on the value and negate the result. In the simplest case the truth value will just call __bool__ on the object.
So by implementing __bool__ (or __nonzero__ in Python 2)...
What's the best way to iterate over two or more containers simultaneously
...like this:
template <typename Container1, typename Container2>
void custom_for_each(
Container1 &c1,
Container2 &c2,
std::function<void(Container1::iterator &it1, Container2::iterator &it2)> f)
{
Container1::iterator begin1 = c1.begin();
Container2::iterator be...
Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
...loop condition to be a boolean, such as while (true) or while (1 == 1). In PHP, keywords are case-insensitive but the language prefers the capitalization TRUE.
However, for (;;) is always completely correct in all of those languages.
...
Get average color of image via Javascript
...ogle it.
I have accomplished the above execution in RGB color space using PHP/GD here: https://gist.github.com/cf23f8bddb307ad4abd8
This however is very computationally expensive. It will crash your system on large images, and will definitely crash your browser if you try it in the client. I have ...
Google OAuth 2 authorization - Error: redirect_uri_mismatch
... to set 'oauth2_redirect_uri' => 'postmessage' in the google API config.php file.
– user2998553
Jun 22 '14 at 18:50
4
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Best way to obfuscate an e-mail address on a website?
...V4YW1wbGUuY29t')">E-Mail</a>
Or dynamically server-side e.g. in PHP:
<a href="javascript:window.location.href=atob('<?= base64_encode("mailto:email@example.com") ?>')">E-Mail</a>
In combination with string reversion it could be pretty spam-save:
<a href="javascrip...
TypeScript type signatures for functions with variable argument counts
...uses the ECMAScript 6 spread proposal,
http://wiki.ecmascript.org/doku.php?id=harmony:spread
but adds type annotations so this would look like,
interface Example {
func(...args: any[]): void;
}
share
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...
JavaScript equivalent to printf/String.Format
I'm looking for a good JavaScript equivalent of the C/PHP printf() or for C#/Java programmers, String.Format() ( IFormatProvider for .NET).
...
Microsoft CDN for jQuery or Google CDN? [closed]
...hangeset)
Since part of our build process is combining and minifying all custom javascript, we do this via a custom script manager that includes the release or debug (non-minified) versions of these scripts depending on the build. Since Google doesn't host the jQuery validation package, this can ...
What is the difference between typeof and instanceof and when should one be used vs. the other?
...
Use instanceof for custom types:
var ClassFirst = function () {};
var ClassSecond = function () {};
var instance = new ClassFirst();
typeof instance; // object
typeof instance == 'ClassFirst'; // false
instance instanceof Object; // true
insta...