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List comprehension in Ruby
...k.nil?
self.collect(&block).compact
end
end
some_array = [1, 2, 3, 4, 5, 6]
new_array = some_array.comprehend {|x| x * 3 if x % 2 == 0}
puts new_array
Prints:
6
12
18
I would probably just do it the way you did though.
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How to unzip a list of tuples into individual lists? [duplicate]
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Use zip(*list):
>>> l = [(1,2), (3,4), (8,9)]
>>> list(zip(*l))
[(1, 3, 8), (2, 4, 9)]
The zip() function pairs up the elements from all inputs, starting with the first values, then the second, etc. By using *l you apply all tuples in l as separat...
What's the best way to send a signal to all members of a process group?
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33 Answers
33
Active
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How to delete a row by reference in data.table?
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edited Nov 23 '18 at 12:47
Henrik
52.1k1111 gold badges117117 silver badges134134 bronze badges
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How do I write JSON data to a file?
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2137
You forgot the actual JSON part - data is a dictionary and not yet JSON-encoded. Write it like ...
How to handle anchor hash linking in AngularJS
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377
You're looking for $anchorScroll().
Here's the (crappy) documentation.
And here's the source...
What is the most efficient way to concatenate N arrays?
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335
If you're concatenating more than two arrays, concat() is the way to go for convenience and li...
Git flow release branches and tags - with or without “v” prefix
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3 Answers
3
Active
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Python Infinity - Any caveats?
...*2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**2
4294967296.0
>>> _**2
1.8446744073709552e+19
>>> _**2
3.4028236692093846e+38
>>> _**2
1.157920892373162e+77
>>> _**2
1.3407807929942597e+154
>>> _**2
Traceba...
Finding local IP addresses using Python's stdlib
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answered Oct 3 '08 at 12:06
Vinko VrsalovicVinko Vrsalovic
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