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Useful code which uses reduce()? [closed]
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24 Answers
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Reversing a linked list in Java, recursively
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piritocle
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answered Dec 10 '08 at 2:28
plinthplinth
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How to get the first and last date of the current year?
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242
SELECT
DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0) AS StartOfYear,
DATEADD(yy, DATEDIFF(yy...
Java recursive Fibonacci sequence
... two. So, you wrote a recursive algorithm.
So,
fibonacci(5) = fibonacci(4) + fibonacci(3)
fibonacci(3) = fibonacci(2) + fibonacci(1)
fibonacci(4) = fibonacci(3) + fibonacci(2)
fibonacci(2) = fibonacci(1) + fibonacci(0)
Now you already know fibonacci(1)==1 and fibonacci(0) == 0. So, you can s...
Is it possible to implement a Python for range loop without an iterator variable?
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Set CSS property in Javascript?
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edited Aug 24 '17 at 10:34
mikemaccana
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Most efficient way to prepend a value to an array
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498
I'm not sure about more efficient in terms of big-O but certainly using the unshift method is ...
How do I remove duplicate items from an array in Perl?
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You can do something like this as demonstrated in perlfaq4:
sub uniq {
my %seen;
grep !$seen{$_}++, @_;
}
my @array = qw(one two three two three);
my @filtered = uniq(@array);
print "@filtered\n";
Outputs:
one two three
If you want to use a module, try the uniq func...
Scala how can I count the number of occurrences in a list
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4
It is the identity function, as discussed here. The function groupBy requires a function that it applies to elements so it knows how to grou...
Double vs single quotes
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204
" " allows you to do string interpolation, e.g.:
world_type = 'Mars'
"Hello #{world_type}"
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