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Difference between Covariance & Contra-variance
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To my future self, who is coming back to this excellent answer again to relearn the difference, this is the line you want: "[Covariance] works because if you're only taking values out of the API, and it's going to return somethi...
jQuery .each() index?
....log("==================== START 1st each ====================");
$('#my_select option').each(function(index, value) {
$results.append("<br>");
// log the index
$results.append("index: " + index);
$results.append("<br>");
console.log("index: " + index);
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Django filter queryset __in for *every* item in list
... tags are not searched for, so won't be counted. I've verified this within my own app.
– tbm
May 2 '18 at 20:26
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show 2 more comments
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Detect URLs in text with JavaScript
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Here is what I ended up using as my regex:
var urlRegex =/(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
This doesn't include trailing punctuation in the URL. Crescent's function works like a charm :)
so:
function ...
How to template If-Else structures in data-bound views?
I constantly find myself using this idiom in KO-based HTML templates:
4 Answers
4
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What database does Google use?
Is it Oracle or MySQL or something they have built themselves?
8 Answers
8
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Do you have to include ?
I didn't include the following line of code in my head tag, however my favicon still appears in my browser:
5 Answers
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PHP Timestamp into DateTime
...t->setTimestamp($timestamp) don't deal with timezones the same way. See my answer @ stackoverflow.com/questions/12038558/… for more details.
– John Slegers
Feb 20 '16 at 16:29
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How do I get the opposite (negation) of a Boolean in Python?
...e could also be achieved with an equivalent lambda function:
>>> my_not_function = lambda item: not item
>>> list(map(my_not_function, lst))
[False, True, False, True]
Do not use the bitwise invert operator ~ on booleans
One might be tempted to use the bitwise invert operator ...
What's the best way to iterate over two or more containers simultaneously
...ly write it as a wrapper around Boost.Range. That said, the performance of my library is already optimal. What I mean by this is that using my indices implementation yields compiler output which is identical to using manual for loops. There is no overhead whatsoever.
– Konrad R...