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Converting a generic list to a CSV string
...ring.Join<T>(string, IEnumerable<T>). This method will automatically project each element x to x.ToString().
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What does the Java assert keyword do, and when should it be used?
...In fact, the assert checks are turned off by default.
However, it is critically important that invariant checks continue to be done in production. This is because perfect test coverage is impossible, and all production code will have bugs which assertions should help to diagnose and mitigate.
Ther...
Heroku 'Permission denied (publickey) fatal: Could not read from remote repository' woes
...and it still didn't work. I ended up having to add an environment variable called HOME set to the directory my .ssh folder was in
– Justin
Dec 31 '13 at 21:31
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Invalidating JSON Web Tokens
... their password. Thus if the password changes, any previous tokens automatically fail to verify. You can extend this to logout by including a last-logout-time in the user's record and using a combination of the last-logout-time and password hash to sign the token. This requires a DB lookup each time...
How do JavaScript closures work?
...eclared outside the function, regardless of when and where the function is called.
If a function was called by a function, which in turn was called by another function, then a chain of references to outer lexical environments is created. This chain is called the scope chain.
In the following code, i...
Reshaping data.frame from wide to long format
...as melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
...
NHibernate ISession Flush: Where and when to use it, and why?
...
Briefly:
Always use transactions
Don't use Close(), instead wrap your calls on an ISession inside a using statement or manage the lifecycle of your ISession somewhere else.
From the documentation:
From time to time the ISession will execute the SQL statements needed to synchronize the ADO.NET...
Re-raise exception with a different type and message, preserving existing information
...exception (and preserve the traceback) or raise NewException(). If I were calling your code, and I received one of your custom exceptions, I'd expect that your code has already handled whatever exception you had to catch. Thus I don't need to access it myself.
Edit: I found this analysis of ways ...
jQuery scroll to element
...rolled to the right position, and if a user copies the URL it will automatically snap to the right place on the page.
– Sander
Jan 23 '14 at 8:09
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What is the colon operator in Ruby?
... 0.180000 0.000000 0.180000 ( 0.179374)
Both symbol tests are basically the same as far as speed. After 1,000,000 iterations there's only 0.004733 second difference, so I'd say it's a wash between which to use.
shar...