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add column to mysql table if it does not exist
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49
Note that INFORMATION_SCHEMA isn't supported in MySQL prior to 5.0. Nor are stored procedures ...
How to turn on/off ReactJS 'development mode'?
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HoldOffHunger
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answered Mar 29 '16 at 13:17
monastic-panicmonas...
Markdown and including multiple files
...like this:
01_preface.md
02_introduction.md
03_why_markdown_is_useful.md
04_limitations_of_markdown.md
05_conclusions.md
You can merge them by doing executing this command within the same directory:
pandoc *.md > markdown_book.html
Since pandoc will merge all the files prior to doing the tr...
How to efficiently compare two unordered lists (not sets) in Python?
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edited Aug 24 '16 at 8:17
CrowbarKZ
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answered Oct 19 ...
Getting a list of all subdirectories in the current directory
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642
Do you mean immediate subdirectories, or every directory right down the tree?
Either way, you...
Multi-line regex support in Vim
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answered Apr 24 '09 at 1:28
Brian CarperBrian Carper
64.9k2525 gold badges154154 silver badges164164 bronze badges
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Sort a list by multiple attributes?
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824
A key can be a function that returns a tuple:
s = sorted(s, key = lambda x: (x[1], x[2]))
Or ...
Can I have onScrollListener for a ScrollView?
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edited Sep 16 '16 at 6:48
Pavneet_Singh
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answe...
Fast Bitmap Blur For Android SDK
...ough the pixels of an image to blur it. This takes about 30 seconds on a 640x480 image.
19 Answers
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How do I remove duplicate items from an array in Perl?
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You can do something like this as demonstrated in perlfaq4:
sub uniq {
my %seen;
grep !$seen{$_}++, @_;
}
my @array = qw(one two three two three);
my @filtered = uniq(@array);
print "@filtered\n";
Outputs:
one two three
If you want to use a module, try the uniq func...