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Are loops really faster in reverse?
...j=i+1, i=j.]]
Really fast loops can be done by unrolling them:
for(i=800000;i>0;--i)
do_it(i);
It can be way slower than
for(i=800000;i>0;i-=8)
{
do_it(i); do_it(i-1); do_it(i-2); ... do_it(i-7);
}
but the reasons for this can be quite complicated (just to mention, there are ...
What is the best Distributed Brute Force countermeasure?
... one second delay would keep a dictionary attack at bay. (dictionary of 10,000 words == 10,000 seconds == about 3 hours. Hmm. Not good enough.)
instead of a site-wide slow down, why not a user-name throttle. The throttle becomes increasingly harsh with each wrong attempt (up to a limit, I guess so t...
how to permit an array with strong parameters
...title"=>"Something", "time_span"=>[{"start"=>"2017-05-06T16:00:00.000Z", "end"=>"2017-05-06T17:00:00.000Z"}]}}
Then this is how I got it to work:
params.require(:link).permit(:title, time_span: [[:start, :end]])
...
How do you match only valid roman numerals with a regular expression?
...ecifies the thousands section and basically restrains it to between 0 and 4000. It's a relatively simple:
0: <empty> matched by M{0}
1000: M matched by M{1}
2000: MM matched by M{2}
3000: MMM matched by M{3}
4000: MMMM matched by M{4}
You could, of course, use some...
Compare DATETIME and DATE ignoring time portion
...try this one
CONVERT(DATE, GETDATE()) = CONVERT(DATE,'2017-11-16 21:57:20.000')
I test that for MS SQL 2014 by following code
select case when CONVERT(DATE, GETDATE()) = CONVERT(DATE,'2017-11-16 21:57:20.000') then 'ok'
else '' end
...
C# List of objects, how do I get the sum of a property
... @Coops - To answer your question...using a list containing 100,000 objects, each object having a single property of datatype double, summing up the property 1,000 times using solution above (myList.Sum) takes 2.44 seconds compared to 0.98 seconds using foreach. The elapsed time is measur...
How do I use boolean variables in Perl?
...lse:
undef - the undefined value
0 the number 0, even if you write it as 000 or 0.0
'' the empty string.
'0' the string that contains a single 0 digit.
All other scalar values, including the following are true:
1 any non-0 number
' ' the string with a space in it
'00' two or more 0 characters ...
Creating and Update Laravel Eloquent
...above example:
Illuminate\Database\QueryException with message 'SQLSTATE[HY000]: General error: 1364 Field '...' doesn't have a default value (SQL: insert into `...` (`...`,.., `updated_at`, `created_at`) values (...,.., xxxx-xx-xx xx:xx:xx, xxxx-xx-xx xx:xx:xx))'
As there would be some field which...
How do I iterate over an NSArray?
....24 454
77,969 258 0.57 453
100,000 390 0.73 534
The classes provided by Cocoa for handling data sets (NSDictionary, NSArray, NSSet etc.) provide a very nice interface for managing information, without having to worry about ...
How to parse XML in Bash?
...m-apple-iso@2x.png</Key>
<LastModified>2011-07-25T22:23:04.000Z</LastModified>
<ETag>&quot;0032a28286680abee71aed5d059c6a09&quot;</ETag>
<Size>1785</Size>
<StorageClass>STANDARD</StorageClass>
</Contents>
</List...