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Scala list concatenation, ::: vs ++
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325
Legacy. List was originally defined to be functional-languages-looking:
1 :: 2 :: Nil // a lis...
Check whether number is even or odd
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204
You can use the modulus operator, but that can be slow. If it's an integer, you can do:
if ( ...
Get the week start date and week end date from week number
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162
You can find the day of week and do a date add on days to get the start and end dates..
DATEADD...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
...must be converted to a string:
require 'date'
DateTime.strptime("1318996912",'%s')
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How can I use numpy.correlate to do autocorrelation?
... result = numpy.correlate(x, x, mode='full')
return result[result.size/2:]
You will, of course, need error checking to make sure that x is actually a 1-d array. Also, this explanation probably isn't the most mathematically rigorous. I've been throwing around infinities because the definition o...
TypeScript sorting an array
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answered Feb 10 '14 at 21:08
SLaksSLaks
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What are “named tuples” in Python?
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Named tuples are basically easy-to-create, lightweight object types. Named tuple instances ca...
Most popular screen sizes/resolutions on Android phones [closed]
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You can see the resolutions for those categories in the Table 2, in this section: http://developer.android.com/guide/practices/screens_support.html#testing
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Are Javascript arrays sparse?
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edited May 23 '17 at 11:54
Community♦
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answered Oct 2 '09 at 17:21
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Python, compute list difference
... matter, you can simply calculate the set difference:
>>> set([1,2,3,4]) - set([2,5])
set([1, 4, 3])
>>> set([2,5]) - set([1,2,3,4])
set([5])
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