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How do I find out if first character of a string is a number?
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Character.isDigit(string.charAt(0))
Note that this will allow any Unicode digit, not just 0-9. You might prefer:
char c = string.charAt(0);
isDigit = (c >= '0' && c <= '9');
Or the slower regex solutions:
s.substring(0, 1).matches("\\d")
// or the equivalent
s.su...
Adding a build configuration in Xcode
...roject as in the screenshot, YES, I selected Info tab THEN my project) but all those options are still greyed out?
– Can Poyrazoğlu
Sep 5 '16 at 7:09
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Bash script absolute path with OS X
...ee simple steps are going to solve this and many other OS X issues:
Install Homebrew
brew install coreutils
grealpath .
(3) may be changed to just realpath, see (2) output
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Pushing read-only GUI properties back into ViewModel
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I wonder if you could do some trickery to automatically attach the properties, without needing Observe. But this looks like a fine solution. Thanks!
– Joe White
Jul 5 '09 at 12:58
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Converting string into datetime
...time is the main routine for parsing strings into datetimes. It can handle all sorts of formats, with the format determined by a format string you give it:
from datetime import datetime
datetime_object = datetime.strptime('Jun 1 2005 1:33PM', '%b %d %Y %I:%M%p')
The resulting datetime object is...
Creating java date object from year,month,day
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Why downvote? My library dates from 2013. All functionality is available in java.time as specified in JSR 310 which I personally find is one of the best designed APIs. I fully recommend using that one.
– Hajo Lemcke
May 30 '19 a...
Padding characters in printf
...amic technique:
printf -v pad '%*s' "$padlimit"
You can do the printing all on one line if you prefer:
printf '%s%*.*s%s\n' "$string1" 0 $((padlength - ${#string1} - ${#string2} )) "$pad" "$string2"
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How do you grep a file and get the next 5 lines
...e was a way to not limit the output to a certain amount of lines but print all lines after the matched one.
– Matthias Braun
May 19 '19 at 17:18
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CSS to set A4 paper size
I need simulate an A4 paper in web and allow to print this page as it is show on browser (Chrome, specifically). I set the element size to 21cm x 29.7cm, but when I send to print (or print preview) it clip my page.
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matplotlib colorbar for scatter
...e a clear application when using matplotlib OOP interface: matplotlib.org/gallery/api/agg_oo_sgskip.html
– Ryszard Cetnarski
Sep 28 '18 at 14:45
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