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How to sort a dataframe by multiple column(s)
...lyr
sort from taRifx
orderBy from doBy
sortData from Deducer
Most of the time you should use the dplyr or data.table solutions, unless having no-dependencies is important, in which case use base::order.
I recently added sort.data.frame to a CRAN package, making it class compatible as discussed ...
How to create GUID / UUID?
... that issue by offsetting the first 13 hex numbers by a hex portion of the timestamp, and once depleted offsets by a hex portion of the microseconds since pageload. That way, even if Math.random is on the same seed, both clients would have to generate the UUID the exact same number of microseconds ...
What is the easiest/best/most correct way to iterate through the characters of a string in Java?
...the String is implemented with an array, the charAt() method is a constant time operation.
String s = "...stuff...";
for (int i = 0; i < s.length(); i++){
char c = s.charAt(i);
//Process char
}
That's what I would do. It seems the easiest to me.
As far as correctness goes, I...
How do you get the current time of day?
How do you get the current time (not date AND time)?
19 Answers
19
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Format a datetime into a string with milliseconds
I want to have a datetime string from the date with milliseconds. This code is typical for me and I'm eager to learn how to shorten it.
...
Convert DateTime to String PHP
I have already researched a lot of site on how can I convert PHP DateTime object to String. I always see "String to DateTime" and not "DateTime to String"
...
Adding one day to a date
... before day adding: ' . $stop_date;
$stop_date = date('Y-m-d H:i:s', strtotime($stop_date . ' +1 day'));
echo 'date after adding 1 day: ' . $stop_date;
?>
For PHP 5.2.0+, you may also do as follows:
$stop_date = new DateTime('2009-09-30 20:24:00');
echo 'date before day adding: ' . $stop_date...
Length of an integer in Python
...og10 method took only 7.486343383789062e-05 seconds, approximately 1501388 times faster!
– FadedCoder
Mar 19 '17 at 16:30
1
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How can I String.Format a TimeSpan object with a custom format in .NET?
What is the recommended way of formatting TimeSpan objects into a string with a custom format?
19 Answers
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Replace multiple whitespaces with single whitespace in JavaScript string
I have strings with extra whitespaces, each time there's more than only one whitespace I'd like it be only one.
11 Answers
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