As I already said in the other topic, scalac -print prints out scala code, not java. It translates all scala keywords that are not directly compatible with java to normal scala code. It is not possible to let the compiler translate only parts afaik. But basically a for-comprehension is always translated the same way. A … Read more
You can write a helper method to do it. public static <T> boolean isIn(T t, T… ts) { for(T t2: ts) if (t.equals(t2)) return true; return false; } // later if (isIn(value, a,b,c)) { } else if (isIn(value, d,e)) { }
for (Iterator<String> i = someIterable.iterator(); i.hasNext();) { String item = i.next(); System.out.println(item); } Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for ( : ) idiom, since the actual iterator is merely inferred. As was noted by Denis Bueno, this … Read more
Can anyone suggest a better alternative? Yes. Don’t do this at all. Just use the while and if statements directly. When you’re programming in C or C++, program in C or C++. While until and unless might be used frequently and idiomatic in some languages, they are not in C or C++.
No. The best you can do, when the expression is overly long, is to assign it to a local variable with a short name, and use {…} to create a scope: { TypeOfFoo it = foo; // foo could be any lengthy expression it.bar(); it.reset(true); myvar = it.getName(); }
No, there is nothing like that in Java. You can only import classes under their original name, and have to use the fully qualified name for all that you don’t import (except those in java.lang and the current class’s package).
Closest thing which could help you are Tuples. C#7 maybe will have something like this: public (int sum, int count) Tally(IEnumerable<int> values) { var res = (sum: 0, count: 0); // infer tuple type from names and values foreach (var value in values) { res.sum += value; res.count++; } return res; } (var sum, var … Read more
Generally, the : notation is used for type ascription, forcing the compiler to see a value as some particular type. This is not quite the same as casting. val b = 1 : Byte val f = 1 : Float val d = 1 : Double In this case, you’re ascribing the special varargs type. … Read more
Microsoft proposes Rolsyn API as an implementation of C# compiler with public API. It contains individual APIs for each of compiler pipeline stages: syntax analysis, symbol creation, binding, MSIL emission. You can provide your own implementation of syntax parser or extend existing one in order to get C# compiler w/ any features you would like. … Read more
You could grab the first and last elements and process them differently, if you like. first = array.shift last = array.pop process_first_one array.each { |x| process_middle_bits } process_last_one