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Are loops really faster in reverse?
...th mentioning is that we are talking about interpreted languages such as Ruby, Python. Compiled languages e.g. Java have optimizations on compiler level which which will "smooth" these differences to the point that it does not matter if .length is in declaration of for loop or not.
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How to convert integer timestamp to Python datetime
...r question?
EDIT: J.F. Sebastian correctly suggested to use true division by 1e3 (float 1000). The difference is significant, if you would like to get precise results, thus I changed my answer. The difference results from the default behaviour of Python 2.x, which always returns int when dividing (...
What's an easy way to read random line from a file in Unix command line?
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You can get shuf on OS X by installing coreutils from Homebrew. Might be called gshuf instead of shuf.
– Alyssa Ross
Dec 27 '13 at 22:27
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Grant **all** privileges on database
... single database.
grant all privileges on mydb.* to myuser@'%' identified by 'mypasswd';
grant all privileges on mydb.* to myuser@localhost identified by 'mypasswd';
% seems to not cover socket communications, that the localhost is for. WITH GRANT OPTION is only good for the super user, otherwise...
How to learn R as a programming language [closed]
...as opposed to learning it as a statistical system. My question is prompted by lack of understanding of such functions as parse, eval, etc. which may not find frequent use by an R user with a 'statistics' persuasion.
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Selecting element by data attribute
...m data attributes plugin. This allows you to write even more readable code by using .dataAttr('foo'), and results in a smaller file size after minification (compared to using .attr('data-foo')).
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Find first element by predicate
... BETTER: since we looking for a boolean return value, we can do it better by adding null check: return dataSource.getParkingLots().stream().filter(parkingLot -> Objects.equals(parkingLot.getId(), id)).findFirst().orElse(null) != null;
– shreedhar bhat
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Replace whole line containing a string using Sed
...ample, using GNU sed:
sed -i '/TEXT_TO_BE_REPLACED/c\This line is removed by the admin.' /tmp/foo
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CSS image resize percentage of itself?
... with a percentage of itself. For example, I just want to shrink the image by half by resizing it to 50%. But applying width: 50%; will resize the image to be 50% of the container element (the parent element which maybe the <body> for example).
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Default value to a parameter while passing by reference in C++
...ault value to a parameter of a function while we are passing the parameter by reference. in C++
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