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How can I declare optional function parameters in Javascript? [duplicate]
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With ES6: This is now part of the language:
function myFunc(a, b = 0) {
// function body
}
Please keep in mind that ES6 checks the values against undefined and not against truthy-ness (so only real undefined values get the default value ...
How to count the number of set bits in a 32-bit integer?
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This is known as the 'Hamming Weight', 'popcount' or 'sideways addition'.
The 'best' algorithm really depends on which CPU you are on and what your usage pattern is.
Some CPUs have a single built-in instruction to do it and others hav...
Volatile vs. Interlocked vs. lock
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+1 for ensuring me to forget about lock-free coding from now.
– Xaqron
Jan 3 '11 at 1:51
5
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How to import multiple .csv files at once?
...mp<-list.files(pattern="*.csv") ddives <- lapply(temp, read.csv) So now each file is called ddives[n] but how would I go about writing a loop to make them all data frames rather than single objects? I can achieve this individually using the data.frame operator but am unsure as to how to loop ...
Architecture for merging multiple user accounts together
...I don't care about the user's email, name, or birth date - I just want to know they're the person who has been logging into this account all along.)
The third-party identities contain information relevant only to authenticating with a third-party. For OAuth, this typically means a user identifier ...
Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v
...thing to RVM that produces lots of errors, the only safe way of fixing for now is to:
sudo apt-get --purge remove ruby-rvm
sudo rm -rf /usr/share/ruby-rvm /etc/rvmrc /etc/profile.d/rvm.sh
open new terminal and validate environment is clean from old RVM settings (should be no output):
env | grep ...
Why doesn't C++ have a garbage collector?
...age collection first of all. My main reason for asking this is that I do know that Bjarne Stroustrup has said that C++ will have a garbage collector at some point in time.
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Why do we need virtual functions in C++?
...eneric food, cats eat rats, all without virtual.
Let's change it a little now so that eat() is called via an intermediate function (a trivial function just for this example):
// This can go at the top of the main.cpp file
void func(Animal *xyz) { xyz->eat(); }
Now our main function is:
Anima...
Service Temporarily Unavailable Magento?
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Now in new version magento2 on Generate error Service Temporarily Unavailable.
Remove maintenance.flag
From this path which is changed magento2/var/maintenance.flag.
Also
$ rm maintenance.flag
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Apache Prefork vs Worker MPM
...ing Module implementing a hybrid multi-threaded multi-process web server
Now, to the difference between prefork and worker.
The prefork MPM
implements a non-threaded, pre-forking web server that handles
requests in a manner similar to Apache 1.3. It is appropriate for
sites that need to ...