keyword
Why are override and final identifiers with special meaning instead of reserved keywords?
Adding new keywords is difficult because it takes away identifiers from the user. It ends up being a trade-off between choosing identifiers that potentially break old code currently using the identifier or choosing names that are highly unlikely to break old code but are ugly or not meaningful to the way they are being used. … Read more
What is the usage of global:: keyword in C#?
Technically, global is not a keyword: it’s a so-called “contextual keyword”. These have special meaning only in a limited program context and can be used as identifiers outside that context. global can and should be used whenever there’s ambiguity or whenever a member is hidden. From here: class TestApp { // Define a new class … Read more
Why does a programming language need keywords?
It’s not necessary — Fortran didn’t reserve any words, so things like: if if .eq. then then if = else else then = if endif are complete legal. This not only makes the language hard for the compiler to parse, but often almost impossible for a person to read or spot errors. for example, consider … Read more
Can I use `abstract` keyword in C++ class
#define abstract
When should clojure keywords be in namespaces?
You should namespace-qualify your keywords if any code is ever going to have a chance to interact with your keywords outside of the context of your namespace. The main example I can think of is two namespaces putting keys and values into a hash-map in a third namespace, where the keys are keywords (as they … Read more
Shorter alternative for ‘lambda’ keyword?
The good news is: You don’t need to use map or filter at all, you can use generator expressions (lazy) or list comprehensions (eager) instead and thus avoid lambdas completely. So instead of: lines = map(lambda x: x.strip(), sys.stdin) Just use: # You can use either of those in Python 2 and 3, but map … Read more
Is “unix” restricted keyword in C?
unix is not a identifier reserved by the Standard. If you compile with -std=c89 or -std=c99 the gcc compiler will accept the program as you expected. From gcc manual ( https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html ), the emphasis is mine. … However, historically system-specific macros have had names with no special prefix; for instance, it is common to find … Read more
C# – Event keyword advantages?
What is the advantage of using the event keyword other than for modifying how the delegate can be accessed? That is the primary advantage of using the event keyword. You use an event over just a raw delegate to prevent the delegate from being invoked or cleared from outside the scope of the class it … Read more
Ruby – Keyword Arguments – Can you treat all of the keyword arguments as a hash? How?
Yes, this is possible, but it’s not very elegant. You’ll have to use the parameters method, which returns an array of the method’s parameters and their types (in this case we only have keyword arguments). def foo(one: 1, two: 2, three: 3) method(__method__).parameters end #=> [[:key, :one], [:key, :two], [:key, :three]] Knowing that, there’s various … Read more