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Functional programming - is immutability expensive? [closed]
...orst case.
Implementing a functional variant of quicksort that operates on arrays defeats the purpose. Arrays are never immutable.
The “proper” functional implementation of quicksort uses immutable lists. It is of course not in-place but it’s got the same worst-case asymptotic runtime (O(n^2))...
JavaScript hashmap equivalent
...t. On average it will take n/2 comparisons.
Ordered.
Example #1: a sorted array — doing a binary search we will find our key after ~log2(n) comparisons on average. Much better.
Example #2: a tree. Again it'll be ~log(n) attempts.
Hash table. On average, it requires a constant time. Compare: O(n...
JavaScript: How to join / combine two arrays to concatenate into one array? [duplicate]
I'm trying to combine 2 arrays in javascript into one.
1 Answer
1
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Suppress Scientific Notation in Numpy When Creating Array From Nested List
...
Python Force-suppress all exponential notation when printing numpy ndarrays, wrangle text justification, rounding and print options:
What follows is an explanation for what is going on, scroll to bottom for code demos.
Passing parameter suppress=True to function set_printoptions works only f...
Why is string concatenation faster than array join?
... browser to optimize string concatenation. Beginning with version 1.0, the array technique is actually slower than using the plus operator in all cases. Other browsers have also optimized string concatenation, so Safari, Opera, Chrome, and Internet Explorer 8 also show better performance using the p...
Why is require_once so bad to use?
... $fp = fopen("/proc/$pid/stat", "r");
$line = fread($fp, 2048);
$array = split(" ", $line);
// Write out the statistics; on RedHat 4.5 with kernel 2.6.9
// 14 is user jiffies; 15 is system jiffies
$cntr = 0;
foreach($array as $elem)
{
$cntr++;
echo "sta...
ng-repeat finish event
...e you also want to call the finished function when there is no item in the array then you may use the following workaround
<div style="display:none" ng-init="things.length < 1 && finished()"></div>
//or
<div ng-if="things.length > 0" ng-init="finished()"></div>...
Is there a numpy builtin to reject outliers from a list
...hod is almost identical to yours, just more numpyst (also working on numpy arrays only):
def reject_outliers(data, m=2):
return data[abs(data - np.mean(data)) < m * np.std(data)]
share
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im...
JavaScript for detecting browser language preference [duplicate]
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Chrome has window.navigator.languages with array of user preferred languages.
– Styx
Oct 6 '15 at 6:33
1
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jQuery vs document.querySelectorAll
...nsidered
var e = document.querySelector("ul.first");
2) Iterate over the array of child nodes via some (possibly nested or recursive) loops and check the class (classlist not available in all browsers!)
//.find('.foo')
for (var i = 0;i<e.length;i++){
// older browser don't have element.cl...