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Why is string concatenation faster than array join?
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I know this is an old thread, but your test is incorrect. You are doing output += myarray[i]; while it should be more like output += "" + myarray[i]; because you've forgot, that you have to glue items together with something. The concat code should be something li...
Is “double hashing” a password less secure than just hashing it once?
...a desktop system can compute 1 million hashes per second. The attacker can test her whole list is less than three hours if only one iteration is used. But if just 2000 iterations are used, that time extends to almost 8 months. To defeat a more sophisticated attacker—one capable of downloading a pr...
What is the purpose of setting a key in data.table?
... 20,000 joins like this on a full table of zip codes. With data tables the script took about 20 min. to run. I didn't even try it with data frames because it would have taken more than 2 weeks.
IMHO you should not just read but study the FAQ and Intro material. It's easier to grasp if you have an a...
Heroku NodeJS http to https ssl forced redirect
...alancer, before encrypted traffic reaches your node app. It is possible to test whether https was used to make the request with req.headers['x-forwarded-proto'] === 'https'.
We don't need to concern ourselves with having local SSL certificates inside the app etc as you might if hosting in other env...
Combining multiple commits before pushing in Git [duplicate]
...or "interactive") with a file that looks like this:
pick 16b5fcc Code in, tests not passing
pick c964dea Getting closer
pick 06cf8ee Something changed
pick 396b4a3 Tests pass
pick 9be7fdb Better comments
pick 7dba9cb All done
Change all the pick to squash (or s) except the first one:
pick 16b5fc...
WebSockets protocol vs HTTP
...TP. It is not. It's an extension.
The main use-case of WebSockets are Javascript applications which run in the web browser and receive real-time data from a server. Games are a good example.
Before WebSockets, the only method for Javascript applications to interact with a server was through XmlHtt...
Is it better practice to use String.format over string Concatenation in Java?
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@MartinSchröder: If you run javap -c StringTest.class you'll see that the compiler converts "+" to StringBuilder automatically only if you are not in a loop. If the concatenation is all done on a single line it's the same as using '+', but if you use myString += "more...
Call apply-like function on each row of dataframe with multiple arguments from each row
...e columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
12 Answers
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Best way to create custom config options for my Rails app?
...t: http://blablalba/blabbitybla/yadda
development:
<<: *defaults
test:
<<: *defaults
production:
<<: *defaults
This configuration file gets loaded from a custom initializer in config/initializers:
# Rails 2
APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml")[...
What is the idiomatic Go equivalent of C's ternary operator?
... idiomatic way.
Why does Go not have the ?: operator?
There is no ternary testing operation in Go. You may use the following to achieve the same result:
if expr {
n = trueVal
} else {
n = falseVal
}
The reason ?: is absent from Go is that the language's designers had seen the operation use...