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Remove duplicate values from JS array [duplicate]
... a = [],
LEN = 1000,
LOOPS = 1000;
while(LEN--)
a = a.concat(r);
var d = new Date();
for(var i = 0; i < LOOPS; i++)
uniq(a);
document.write('<br>uniq, ms/loop: ' + (new Date() - d)/LOOPS)
var d = new Date();
for(var i = 0; i < LOOPS; i++)
uniq_fast...
Finding all possible combinations of numbers to reach a given sum
...emaining = numbers.slice(i + 1);
subsetSum(remaining, target, partial.concat([n]));
}
}
subsetSum([3,9,8,4,5,7,10],15);
// output:
// 3+8+4=15
// 3+5+7=15
// 8+7=15
// 5+10=15
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Standard alternative to GCC's ##__VA_ARGS__ trick?
...election of either REST_HELPER_ONE() or REST_HELPER_TWOORMORE() is done by concatenating REST_HELPER_ with the expansion of NUM(__VA_ARGS__) in REST_HELPER2(). Note that the purpose of REST_HELPER() is to ensure that NUM(__VA_ARGS__) is fully expanded before being concatenated with REST_HELPER_.
E...
Functional programming - is immutability expensive? [closed]
...rades average performance considerably.
Secondly, this algorithm uses list concatenation (instead of list construction) which is an O(n) operation. This doesn’t impact on the asymptotic complexity but it’s a measurable factor.
A third disadvantage is somewhat hidden: unlike the “in-place” ...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...期初所支付的实际费用。
例4.4 贷款买房问题 贷款金额50000元，贷款年利率5.31%，采取分期付款方式（每年年末还固定金额，直至还清）。问拟贷款10年，每年需偿还多少元？
LINGO代码如下：
50000 = x * @fpa(.0531,10);
答案是x=6573.0...
Android: install .apk programmatically [duplicate]
...t(i) == '.'))
{
temp = temp.toString().concat(Character.toString(s.charAt(i))) ;
i++;
}
//
s = s.substring(i); // Move to Next to Process.!
temp = temp + " "; // Separate w.r.t Spa...
What is the most efficient/elegant way to parse a flat table into a tree?
...r_id = 1
ORDER BY f.name;
Re comment from @Nate:
SELECT f.name, GROUP_CONCAT(b.ancestor_id order by b.path_length desc) AS breadcrumbs
FROM FlatTable f
JOIN ClosureTable a ON (f.id = a.descendant_id)
JOIN ClosureTable b ON (b.descendant_id = a.descendant_id)
WHERE a.ancestor_id = 1
GROUP BY...
What are free monads?
...ll x) = Roll (fmap (fmap f) x)
--this is the same thing as (++) basically
concatFree :: Functor f => Free f (Free f a) -> Free f a
concatFree (Pure x) = x
concatFree (Roll y) = Roll (fmap concatFree y)
instance Functor f => Monad (Free f) where
return = Pure -- just like []
x >>...
How can I access and process nested objects, arrays or JSON?
...ed object, in this case [ 1, 2, [ 3, 4 ] ] Wouldn't it be better to to use concat in the recursive call instead of push ? (requiring result to be mutable)
– ElFitz
May 3 '18 at 15:44
...
Are HLists nothing more than a convoluted way of writing tuples?
...
write a generic prepend/append function
write a reverse function
write a concat function
...
You can do all of that with tuples of course, but not in the general case. So using HLists makes your code more DRY.
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