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How to sort an array based on the length of each element?
...y remain in their original order).
If the objective is to sort by length then by dictionary order you must specify additional criteria:
["c", "a", "b"].sort(function(a, b) {
return a.length - b.length || // sort by length, if equal then
a.localeCompare(b); // sort by dictionary orde...
Mimicking sets in JavaScript?
...e ES6 capabilities you need or transpiling ES6 code for your environment), then you can use the Set object built into ES6. It has very nice capabilities and can be used as is right in your environment.
For many simple things in an ES5 environment, using an Object works very well. If obj is your o...
Should I pass an std::function by const-reference?
...( std::function<void()> )
which runs some code in the "ui" thread, then signals the future when done. (Useful in UI frameworks where the UI thread is where you are supposed to mess with UI elements)
We have two signatures we are considering:
std::future<void> run_in_ui_thread( std::...
Plot a legend outside of the plotting area in base graphics?
...is to overlay your plot with a transparent plot over the entire device and then add the legend to that.
The trick is to overlay a (empty) graph over the complete plotting area and adding the legend to that. We can use the par(fig=...) option. First we instruct R to create a new plot over the entire...
Libraries not found when using CocoaPods with iOS logic tests
...your Podfile. Something like:
link_with 'MainTarget', 'MainTargetTests'
Then run pod install again.
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SQL Server - SELECT FROM stored procedure
...
create a table variable to hold the
result set from the stored proc and
then
insert the output of the
stored proc into the table variable,
and then
use the table variable
exactly as you would any other
table...
... sql ....
Declare @T Table ([column definitions here...
How to determine the memory footprint (size) of a variable?
...-available/memprof.ini
sudo php5enmod memprof
service apache2 restart
And then in my code:
<?php
memprof_enable();
// do your stuff
memprof_dump_callgrind(fopen("/tmp/callgrind.out", "w"));
Finally open the callgrind.out file with KCachegrind
Using Google gperftools (recommended!)
First of all ...
Why is Java's SimpleDateFormat not thread-safe? [duplicate]
...pleDateFormat.
For example parse(..) calls calendar.clear() initially and then calendar.add(..). If another thread invokes parse(..) before the completion of the first invocation, it will clear the calendar, but the other invocation will expect it to be populated with intermediate results of the ca...
How much faster is C++ than C#?
...plementing your application correctly in whatever language suits you best, then find performance bottlenecks if it runs too slow, and then think about how to optimize the code. In the worst case, you might need to call out to C code through a foreign function interface, so you'll still have the abil...
Git push to wrong branch
...ce you have done that, switch back to the desired branch and there you can then use git cherry-pick to pick specific commits from the git refs and merge it into the right branch.
git checkout wrong_branch
git revert commitsha1
git revert commitsha2
git checkout right_branch
git cherry-pick commitsh...