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Simple explanation of MapReduce?
...gt; x + y )
sum = B.reduce( sum, (x, y) => x + y )
or a version you'd more likely to find in the real world:
A = [7, 8, 9]
B = [1, 2, 3]
sum_func = (x, y) => x + y
sum = A.reduce( B.reduce( 0, sum_func ), sum_func )
Its a good thing in a DB software because, with Map\Reduce support you...
Regular expression to return text between parenthesis
... What if you'll have "(some text (some text in inner parenthesis) some more text)"?
– Igor Pomaranskiy
Jul 13 '16 at 12:17
5
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Pythonic way to check if a list is sorted or not
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Looks like Python 3.x does not have xrange anymore, just use range. I get NameError: name 'xrange' is not defined when I run that code. I switched it to just use range instead of xrange and that works fine. See: stackoverflow.com/questions/15014310/…
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How can I determine if a String is non-null and not only whitespace in Groovy?
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show 2 more comments
9
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Mercurial .hgignore for Visual Studio 2010 projects
... @David: That's for Windows thumbnail cache files "thumbs.db" read more about it here: en.wikipedia.org/wiki/Windows_thumbnail_cache
– Shady M. Najib
Apr 13 '11 at 19:34
1
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Difference between 2 dates in SQLite
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This answer is far more feature filled than the accepted answer, IMHO.
– Marcus Parsons
Oct 18 '18 at 14:37
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add column to mysql table if it does not exist
...atabase_1_0_to_2_0() $$
DELIMITER ;
On a first glance it probably looks more complicated than it should, but we have to deal with following problems here:
IF statements only work in stored procedures, not when run directly,
e.g. in mysql client
more elegant and concise SHOW COLUMNS does not wor...
How to make a Java class that implements one interface with two generic types?
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Use JNI instead of JNA to call native code?
... without copying.
These are the problems I've encountered. Maybe there's more. But in general performance is not that different between jna and jni, so wherever you can use JNA, use it.
EDIT
This answer seems to be quite popular. So here are some additions:
If you need to map C++ or COM, there...
Using Git, show all commits that are in one branch, but not the other(s)
... branches which contain the commits from "branch-to-delete".
If it reports more than just "branch-to-delete", the branch has been merged.
Your alternatives are really just rev-list syntax things. e.g. git log one-branch..another-branch shows everything that one-branch needs to have everything ano...