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Implications of foldr vs. foldl (or foldl')
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175
The recursion for foldr f x ys where ys = [y1,y2,...,yk] looks like
f y1 (f y2 (... (f yk x) ...
How to get the last element of an array in Ruby?
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Use -1 index (negative indices count backward from the end of the array):
a[-1] # => 5
b[-1] # => 6
or Array#last method:
a.last # => 5
b.last # => 6
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Get last result in interactive Python shell
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Underscore.
>>> 5+5
10
>>> _
10
>>> _ + 5
15
>>> _
15
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How to remove item from array by value? [duplicate]
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Python using enumerate inside list comprehension
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167
Try this:
[(i, j) for i, j in enumerate(mylist)]
You need to put i,j inside a tuple for the...
How to remove duplicate values from a multi-dimensional array in PHP
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Convert dmesg timestamp to custom date format
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182
Understanding dmesg timestamp is pretty simple: it is time in seconds since the kernel started...
No increment operator (++) in Ruby? [duplicate]
...s: -x == ---x == -----x == ...... To increment a number, simply write x += 1.
Taken from "Things That Newcomers to Ruby Should Know
" (archive, mirror)
That explains it better than I ever could.
EDIT: and the reason from the language author himself (source):
++ and -- are NOT reserved ope...
Installing PG gem on OS X - failure to build native extension
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