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What is the purpose of the reader monad?
...Closure = (Term, Env)
When we are done, we should get out a value (or an error):
data Value = Lam String Closure | Failure String
So, let's write the interpreter:
interp' :: Term -> Reader Env Value
--when we have a lambda term, we can just return it
interp' (Lambda nv t)
= do env <-...
What's the difference between a continuation and a callback?
...
Apologies if I have made any errors in the JavaScript examples. Writing this answer has roughly doubled the total amount of JavaScript I've written.
– cpcallen
Oct 24 '16 at 22:28
...
What and where are the stack and heap?
... your programming language uses to allocate and free memory, and check for errors (if the allocation/freeing fails for any reason).
What determines the size of each of them?
Again, it depends on the language, compiler, operating system and architecture. A stack is usually pre-allocated, because by...
RegEx for matching UK Postcodes
...ts better to loosely match with a simplified regex to weed out the obvious errors and then apply further checks such as an address lookup (or confirmation email in the case of email regex) to confirm the validity.
– James Coyle
Mar 22 '19 at 9:20
...
Difference between GIT and CVS
...ut inconveniencing other users. In particular if you notice typo (or other error) in commit message, or a bug in commit, you can simply use "git commit --amend". This is not possible (at least not without heavy hackery) in CVS.
More tools. Git offers much more tools than CVS. One of more important i...
What does T&& (double ampersand) mean in C++11?
...[] pt1{new int[10]};
std::unique_ptr<int[]> ptr2{ptr1};// compile error: no copy ctor.
// So we must first cast ptr1 to an rvalue
std::unique_ptr<int[]> ptr2{std::move(ptr1)};
std::unique_ptr<int[]> TakeOwnershipAndAlter(std::unique_ptr<int[]> param,\
int size) ...
How do I print a list of “Build Settings” in Xcode project?
... YES
GCC_THUMB_SUPPORT YES
GCC_TREAT_WARNINGS_AS_ERRORS NO
GCC_VERSION com.apple.compilers.llvm.clang.1_0
GCC_VERSION_IDENTIFIER com_apple_compilers_llvm_clang_1_0
GCC_WARN_ABOUT_RETURN_TYPE YE...
RESTful Authentication
...d response. If you don't like it, just send a 403 Forbidden instead. The error page may include a method to login or a link to it. However, but biggest argument against cookies AND http authentication (regardless of whether the state is server side or client side) is that they are vulnerable to c...
Cross-browser testing: All major browsers on ONE machine
... addons.mozilla.org)
4+ Ctrl Shift K Web console Built-in
All Ctrl Shift J Error console Built-in (Extensible using Console2)
Opera
9.5+ Ctrl Shift I Opera Dragonfly Built-in
15+ Ctrl Shift J Chromium Developer Tools Built-in.
Chrome
All Ctrl Shift J Chrome Developer Tools Built-in.
Safari
...
Scala: Abstract types vs generics
... def back(x:B):A
}
The compiler will object with bunch of variance check errors
In that case you may gather all type requirements in additional trait and parametrize other traits over it
//one trait to rule them all
trait OO[O <: OO[O]] { this : O =>
type A <: AA[O]
type B <: BB[...