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Are (non-void) self-closing tags valid in HTML5?
...HTML failed before HTML 5 was even on the horizon, and you can't have long form empty elements because browser error correction that predated XHTML would do things like treating </br> as <br> so <br></br> would be a double line break. (and backwards compatibility with real wo...
How many bytes does one Unicode character take?
... useful in computing systems we need to choose a representation for this information. Those are the various unicode encodings, such as utf-8, utf-16le, utf-32 etc. They are distinguished largely by the size of of their codeunits. UTF-32 is the simplest encoding, it has a codeunit that is 32bits, whi...
Citing the author of a blockquote using Markdown syntax
...people or organization) or an URL reference, or a reference in abbreviated form as per the conventions used for the addition of citation metadata.
– Zelphir Kaltstahl
Oct 31 '15 at 16:29
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Validate that a string is a positive integer
...r 9,007,199,254,740,992; for instance, 1234567890123456789 will fail). The former is an easy fix, the latter two not so much.
Regular Expression
The other approach is to test the characters of the string via a regular expression, if your goal is to just allow (say) an optional + followed by either...
Applicatives compose, monads don't
... Is it true, that for any monads m and n you can always write a monad transformer mt, and operate in n (m t) using mt n t? So you can always compose monads, it is just more complicated, using transformers?
– ron
Jun 19 '12 at 11:11
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Possible reason for NGINX 499 error codes
...cial case, I noticed it sometimes happen when the end-user double-clicks a form submit button. The form is sent twice, but only one response is expected by the client. This can be worked around by disabling (at least for a few seconds) buttons in JS the first time they get clicked.
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Difference between except: and except Exception as e: in Python
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It is also worth noting that the second form should only be used if you do not care about what the exception was or wish to handle it in a meaningful way.
– Josh J
Apr 26 '19 at 20:47
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PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...t transaction id.
A UUID is a 16-octet (128-bit) number. In its canonical form, a UUID is represented by 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and four hyphens).
function generate_uuid()...
How to trigger event when a variable's value is changed?
...t the event has been raised or in case that you are dealing with a Windows Form you can use a BackgourndWorker to do things in a parallel thread nice and easy.
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What's the difference between Invoke() and BeginInvoke()
...it was mostly geared towards Delegate.BeginInvoke, I suspect.
For Windows Forms apps, I would suggest that you should usually use BeginInvoke. That way you don't need to worry about deadlock, for example - but you need to understand that the UI may not have been updated by the time you next look at...