大约有 45,000 项符合查询结果（耗时：0.0347秒） [XML]
Standard deviation of a list
... function _sum rather than the built-in sum which I've used in its place.
Now we have for example:
>>> mean([1, 2, 3])
2.0
>>> stddev([1, 2, 3]) # population standard deviation
0.816496580927726
>>> stddev([1, 2, 3], ddof=1) # sample standard deviation
0.1
...
Calculate age given the birth date in the format YYYYMMDD
...on _calculateAge(birthday) { // birthday is a date
var ageDifMs = Date.now() - birthday.getTime();
var ageDate = new Date(ageDifMs); // miliseconds from epoch
return Math.abs(ageDate.getUTCFullYear() - 1970);
}
Disclaimer: This also has precision issues, so this cannot be completely tr...
Deleting multiple elements from a list
...ual program logic, and exists solely for technical reasons. Even though by now I already understand the logic thoroughly, I still feel it would be difficult to read.
– Imperishable Night
Oct 27 '18 at 3:20
...
How to split a long regular expression into multiple lines in JavaScript?
... function(reg){ return reg.source; }
).join(''), options);
}
And now let's rock
var r = multilineRegExp([
/^foo/, // we can add comments too
/(.*)/,
/\bar$/
]);
Since it has a cost, try to build the real regex just once and then use that.
...
Performance optimization strategies of last resort [closed]
...e of changes was this:
The first problem found was use of list clusters (now called "iterators" and "container classes") accounting for over half the time. Those were replaced with fairly simple code, bringing the time down to 20 seconds.
Now the largest time-taker is more list-building. As a perc...
How do I check if a string contains a specific word?
...s "falsey", we can't use simpler constructs like !strpos($a, 'are').
Edit:
Now with PHP 8 you can do this:
if (str_contains('How are you', 'are')) {
echo 'true';
}
RFC
str_contains
share
|
imp...
PHP Fatal error: Using $this when not in object context
...
@Sarfraz it's better now. Sorry for pestering you, but as this became the accepted answer, I felt it necessary to point these things out :) Thanks for your patience.
– Gordon
Feb 28 '10 at 13:00
...
Animate scrollTop not working in firefox
....
var element = ( html.scrollTop === newY ) ? 'html' : 'body';
// now reset back to the starting position
window.scrollTo(0, startingY);
return element;
}
// store the element selector name in a global var -
// we'll use this as the selector for our page scrolling animation.
scrol...
How do I create a URL shortener?
...for example).
For this example, I will use 12510 (125 with a base of 10).
Now you have to convert 12510 to X62 (base 62).
12510 = 2×621 + 1×620 = [2,1]
This requires the use of integer division and modulo. A pseudo-code example:
digits = []
while num > 0
remainder = modulo(num, 62)
dig...
jQueryUI Tooltips are competing with Twitter Bootstrap
...lts 7 times. I then went and downloaded a customized jQuery UI package and now when I "clear cache and hard refresh" 30 times, I get working results 30 times with 0 errors. I would also add that I'm using require.js so I can easily control the order in which libraries are loaded.
...