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List comprehension vs map
...ing map() over list comprehension or vice versa? Is either of them generally more efficient or considered generally more pythonic than the other?
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Hidden Features of MySQL
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Since you put up a bounty, I'll share my hard won secrets...
In general, all the SQLs I tuned today required using sub-queries. Having come from Oracle database world, things I took for granted weren’t working the same with MySQL. And my reading on MySQL tuning makes me conclude that MySQL is be...
Why does PHP 5.2+ disallow abstract static class methods?
...2, I saw a load of strict standards warnings from a project that was originally written without strict warnings:
8 Answers
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Getting the count of unique values in a column in bash
... count the frequency of occurrence of the different values in a column for all the files in a folder and sort them in decreasing order of count (highest count first). How would I accomplish this in a Linux command line environment?
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Extract every nth element of a vector
...it can be used on a temporary; in order to use seq you have to be able to call length on the vector. letters[letters < 'm'][c(TRUE, FALSE, FALSE)]
– Matt Chambers
Sep 14 '17 at 21:07
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What does the third parameter (false) indicate in document.addEventListener(“deviceready”,OnDeviceRe
...es that the user wishes to
initiate capture. After initiating
capture, all events of the specified
type will be dispatched to the
registered listener before being
dispatched to any EventTargets beneath
it in the DOM tree. Events which are
bubbling upward through the tree will
not tri...
A variable modified inside a while loop is not remembered
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@AvinashYadav The problem isn't really related to while loop or for loop; rather the use of subshell i.e., in cmd1 | cmd2, cmd2 is in a subshell. So if a for loop is executed in a subshell, the unexpected/problematic behaviour will be exhibited.
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Image library for Python 3
...actively being developed as for Oct 2014, has a nice doc, you may pip3 install Image (I was using pillow without knowing), and you from PIL import Image. It also supports all the major platforms now. When looking for a PIL for python3, this is definitely the choice.
– Yosh
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What are the differences between Deferred, Promise and Future in JavaScript?
...the differences between Deferreds, Promises and Futures?
Is there a generally approved theory behind all these three?
5 A...
Set Value of Input Using Javascript Function
...g and forgot about the page underneath).
Changing the ID so it was unique allowed me to use the methods listed in Sangeet's answer.
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