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Create an array with same element repeated multiple times
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It's much more efficient to allocate all of the entries up front, with arr = new Array(len);, then assign to them by index in the loop, i.e. arr[i] = value;. That way you only pay O(n) rather than having to keep reallocating the array...
How can I visualize per-character differences in a unified diff file?
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148
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Geometric Mean: is there a built-in?
...))
}
}
Note that it also checks for any negative values, and returns a more informative and appropriate NaN respecting that geometric mean is not defined for negative values (but is for zeros). Thanks to commenters who stayed on my case about this.
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iOS Detection of Screenshot?
...sumed that as well from the word "did" but the documentation makes it even more clear. In my app I'm allowing people to edit photos but some of the tools require IAPs. But I let them try before buy. So I wanted to detect before it was captured to add a watermark. Can't be done.
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How can I force clients to refresh JavaScript files?
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Bower and devDependencies vs dependencies
...ependencies, as you have it, won't be harmful; the module will just bundle more files (bytes) during the install - consuming more (unnecessary) resources. From a purist POV, these extra bytes could be detrimental, just depends on your perspective.
To shed some light, looking at bower help install, ...
Why doesn't Java support unsigned ints?
...gree with Gosling here with a specific example (from CLR no less). What's more confusing giving an Array a signed integer length value or an unsigned length? It's impossible for an Array to have negative length yet our API indicates that's possible.
– JaredPar
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How do you avoid over-populating the PATH Environment Variable in Windows?
...d line, but now I come to the limit of the path string, so i can't add any more dir.
12 Answers
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In Django, how do I check if a user is in a certain group?
...hen user.groups.all() returns [<Group: Editor>].
Alternatively, and more directly, you can check if a a user is in a group by:
if django_user.groups.filter(name = groupname).exists():
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Note that groupname can also be the actual Django Group object.
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What's the difference between an id and a class?
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TBH, nobody use id any more unless it has something to do with integration with JavaScript (when you need an unique value). It is html leftover and you do not need to use it just because it exists. Saying that you have only one header and such so y...