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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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Clicking the text to select corresponding radio button
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174
In your code, you've got a label on the form itself. You want to put labels on each individual...
Adding an identity to an existing column
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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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How to remove duplicate values from a multi-dimensional array in PHP
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