I wonder, why doesn't this work:
object test {
def method1(a: Int) = println(a) // println a -- doesn't work either
method1 123
}
method1 takes only parameter, that is, it can be possible to omit parenthesis, can't it?
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Alan Coromano
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This was already answered here: http://stackoverflow.com/questions/1181533/what-are-the-precise-rules-for-when-you-can-omit-parenthesis-dots-braces-f – Eugene Ryzhikov Aug 14 '13 at 17:04
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This is a conflict with postfix operation. Let's have a look at your example:
println a
The parser would interpret this as
println.a
It would be very confusing if you could write
println 123
(which is distinguishable, since 123 is not a valid method name), but now if you replace 123 by a variable holding the value, you'll get something like member a not found on println.
gzm0
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why does `startWith` work `val map2 = Map(1->"1", 2->"2") filter { kv => kv._1 startsWith "A" }`? – Alan Coromano Aug 15 '13 at 08:30
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why is this not the same as `kv._1.startsWith."A"` ? because println a is the same as println.a – Alan Coromano Aug 15 '13 at 21:47