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Find MongoDB records where array field is not empty
...l, mongoDB won't use indexes if $size is involved link. Would be better to include {$ne:[]} and possibly {$ne:null}.
– Levente Dobson
Feb 12 '15 at 11:27
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jQuery Validate - require at least one field in a group to be filled
...class="fillone" type="text" value="" name="field4" />
Don't forget to include additional-methods.js file!
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Why are static variables considered evil?
...l for software (as well as cars), that competent design DEMANDS that it be included.
– Dawood ibn Kareem
Dec 30 '11 at 10:48
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Can I use assert on Android devices?
... set to ignore assertion checks by default, even though the .dex byte code includes the code to perform the check. Checking assertions is turned on in one of two ways:
(1) by setting the system property "debug.assert" via:
adb shell setprop debug.assert 1
which I verified works as intended as l...
Best way to use PHP to encrypt and decrypt passwords? [duplicate]
... line). As far as how to encrypt data, take a look at this SO Answer which includes the proper tools to set it up correctly... Example: you're missing padding (which CBC requires)...
– ircmaxell
Dec 11 '12 at 17:11
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Which is the preferred way to concatenate a string in Python?
...pretty slow, appending to a list was much faster. That that timing doesn't include the final a.join(). So how long would that take?
a.join(a):
0.43739795684814453
Oups. Turns out even in this case, append/join is slower.
So where does this recommendation come from? Python 2?
a += b:
0.16528701...
Proper way to handle multiple forms on one page in Django
... 3) Determine which form is submitted from field names in POST data. Include some hidden inputs if your froms don't have unique fields with all possible values being not empty.
– Denis Otkidach
Oct 24 '09 at 16:39
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Haskell, Lisp, and verbosity [closed]
...hing you can do with macros you can do with a higher-order function (and I include monads, arrows, etc.), but it might require more thinking (but only the first time, and it's fun and you'll be a better programmer for it), and
the static system is sufficiently general that it never gets in your way,...
SQL - Rounding off to 2 decimal places
... other similar questions. Please edit your answer to add some explanation, including the assumptions you've made.
– sepehr
Oct 25 '18 at 15:08
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What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...address multidimensional indices (and even stencils).
The repa-io package includes support for reading and writing .bmp image files, though support for more formats is needed.
Addressing your specific questions, here is a graphic, with discussion:
On what basis should I choose between Vecto...