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What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...ally writing such a function is difficult. I see in your profile that you know Haskell, so maybe you're thinking in algebraic data types and pattern matching? Consider that an uninhabited type must have no constructors and, thus, nothing to pattern match against. You'd have to write a "function" wit...
What is this weird colon-member (“ : ”) syntax in the constructor?
...entry is that,
All other things being equal, your code will run faster if you use initialization lists rather than assignment.
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Combine multiple Collections into a single logical Collection?
... constant number of collections (e.g. 3 ArrayLists) as members of a class. Now, I want to expose all the elements to other classes so they can simply iterate over all elements (ideally, read only).
I'm using guava collections and I wonder how I could use guava iterables/iterators to generate a logic...
Subscripts in plots in R
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If you are looking to have multiple subscripts in one text then use the star(*) to separate the sections:
plot(1:10, xlab=expression('hi'[5]*'there'[6]^8*'you'[2]))
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What is a stack trace, and how can I use it to debug my application errors?
...essionImpl.java:689)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.context.ThreadLocalSessionContext$Transact...
What version of javac built my jar?
... file, and it could have been built in any one of three JDKs. We need to know exactly which one, so we can certify compatibility. Is the compiler version embedded somewhere in the class files or jar?
...
What is a web service endpoint?
... have multiple endpoints, for example in order to make it available using different protocols.
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Return HTTP status code 201 in flask
We're using Flask for one of our API's and I was just wondering if anyone knew how to return a HTTP response 201?
9 Answers...
Postgresql aggregate array
...ent s
LEFT JOIN Grade g ON g.Student_id = s.Id
GROUP BY s.Id
By the way, if you are using Postgres 9.1, you don't need to repeat the columns on SELECT to GROUP BY, e.g. you don't need to repeat the student name on GROUP BY. You can merely GROUP BY on primary key. If you remove the primary key on s...
How to generate a random int in C?
... bigger reason is that the properties of rand() and functions like it are known best for the use case where they are seeded exactly once per run, and not on every single call. Depending on "randomness" with untested or unproven properties leads to trouble.
– RBerteig
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