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Haskell function composition (.) and function application ($) idioms: correct use
...han this one; from one of the authors himself. :) And that makes sense, it does look much quieter on the page as I read. Marking this as the answer because It directly answers the question. Thankyou for the response; and, infact, the book.
– Robert Massaioli
Ju...
How to write file if parent folder doesn't exist?
... noop. Otherwise it creates all missing directories for you.
This module does what you want: https://npmjs.org/package/writefile . Got it when googling for "writefile mkdirp". This module returns a promise instead of taking a callback, so be sure to read some introduction to promises first. It mig...
Calling parent class __init__ with multiple inheritance, what's the right way?
...
No, they don't. If B's init doesn't call super, then B's init will not be called if we do the super().__init__() approach. If I call A.__init__() and B.__init__() directly, then (if A and B do call super) I get B's init being called multiple times.
...
Select elements by attribute
...('#A').attr('myattr')) {
// attribute exists
} else {
// attribute does not exist
}
EDIT:
The above will fall into the else-branch when myattr exists but is an empty string or "0". If that's a problem you should explicitly test on undefined:
if ($('#A').attr('myattr') !== undefined) {
...
Split string every nth character?
...
@TrevorRudolph It only does exactly what you tell it. The above answer is really only just a for loop but expressed pythonically. Also, if you need to remember a "simplistic" answer, there are at least hundreds of thousands of ways to remember them...
Default implementation for Object.GetHashCode()
How does the default implementation for GetHashCode() work? And does it handle structures, classes, arrays, etc. efficiently and well enough?
...
The simplest possible JavaScript countdown timer? [closed]
... diff = duration - (((Date.now() - start) / 1000) | 0);
// does the same job as parseInt truncates the float
minutes = (diff / 60) | 0;
seconds = (diff % 60) | 0;
minutes = minutes < 10 ? "0" + minutes : minutes;
seconds = seconds < 10 ? "0...
Performance of static methods vs instance methods
..., we should expect a static method that takes an object as a parameter and does something with it to be slightly less good than the equivalent as an instance on that same object. Again though, the difference is so slight that if you tried to measure it you'd probably end up measuring some other comp...
REST HTTP status codes for failed validation or invalid duplicate
... logical errors: syntax, framing, routing. Thus, I consider that HTTP spec does not allow 400 for failed validation on application level.
– Dima Tisnek
Sep 23 '14 at 12:22
4
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How to count the number of set bits in a 32-bit integer?
...e odd / even bits, shifting to line them up, and adding. This effectively does 16 separate additions in 2-bit accumulators (SWAR = SIMD Within A Register). Like (i & 0x55555555) + ((i>>1) & 0x55555555).
The next step takes the odd/even eight of those 16x 2-bit accumulators and adds a...