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How to generate a random alpha-numeric string?
... .withinRange('0', 'z')
.filteredBy(CharacterPredicates.LETTERS, CharacterPredicates.DIGITS)
.build();
randomStringGenerator.generate(12); // toUpperCase() if you want
Since commons-lang 3.6, RandomStringUtils is deprecated.
...
Is gettimeofday() guaranteed to be of microsecond resolution?
...ure (I'm still trying to get the patch in) there will be a CLOCK_MONOTONIC_RAW that will not be modified at all, and will have a linear correlation with the hardware counters." I don't think the _RAW clock ever made it into the kernel (unless it was renamed _HR, but my research suggests that effort...
Regular expression search replace in Sublime Text 2
... pattern:
my name is (\w)+
is incorrect and will only capture the final letter of the name rather than the whole name. You should use the following pattern to capture all of the letters of the name:
my name is (\w+)
sha...
Hidden Features of Xcode
... Groups and Files pane
Control ⌃ Option ⌥ Shift ⇧ + <First letter of a Group name>
If you hold down the three keys above, you can quickly jump to groups in the left (Groups and Files) page by pressing the first letter of a groups name. For example, Control ⌃Option ⌥Shift ...
Is there a good reason to use upper case for SQL keywords? [closed]
...PEOPLE DID NOT HAVE THE POSSIBILITY OF ENCODING ANYTHING BEYOND UPPER CASE LETTERS BECAUSE THE RELEVANT ENCODING (ASCII) WAS NOT YET INVENTED. ONLY SIX BITS WERE AVAILABLE. WHILE SQL IS MORE RECENT, LOWER CASE LETTERS WERE NOT COMMON PRACTICE IN PROGRAMMING YET.
NOTE THAT SOME PEOPLE CLAIM THAT THE...
How far can memory leaks go?
...nly thing you need to worry about when dealing with new/delete (instead of raw malloc/free). The memory that's allocated in new may get reclaimed, but things that may be done in the destructors of the objects will not happen. Perhaps the destructor of some class writes a sentinel value into a file...
How to sort strings in JavaScript
...character). That is, either all before numbers, or all between numbers and letters (lowercase & uppercase being "together" one after another), or all after letters.
My conclusion is that they all fail to provide a consistent order when I start adding barely unusual characters (ie. characters wi...
How can I sort arrays and data in PHP?
...', 'Apple', 'Leicester', 'Lovely']
And now you want to sort on the first letter only:
usort($array, function($a, $b) {
return strcmp($a[0], $b[0]);
});
The outcome is this:
['Apple', 'Aardvark', 'Kale', 'Kaleidoscope', 'Lovely', 'Leicester']
The sort wasn't stable!
The keen observer may...
Best way to reverse a string
...g that contains non-BMP characters, e.g., "\U00010380\U00010381" (Ugaritic Letter Alpa, Ugaritic Letter Beta).
public static string Reverse(this string input)
{
if (input == null)
throw new ArgumentNullException("input");
// allocate a buffer to hold the output
char[] output = ...
Python Pandas merge only certain columns
...missed something from the proposed answer: list('xab') takes each element (letter) of the string 'xab' and converts it to a list element so list('xab') returns ['x', 'a', 'b']. That works if each column has a single letter as a name. In your case I think you need to do df1.merge(df2['Unique_External...