Am 13.08.2015 07:11, schrieb KARR, DAVID:
[...]
def (int a, int[] b) = [1, 2, 3, 4] // Given this ...
println("a[$a] b[$b]")
Putting this all into a script, this outputs this:
a[1] b[[2, 3, 4]]
a[1] b[[2]]
that's multiple assignment we are talking about. It is basically defined
like this:
for "def (x_0,x_1,...,x_n) = l" we get x_i=l[i] but with type/value
transformations according to Groovy rules. Or in other words, it is
equal to:
def x_0 = l[0]
def x_1 = l[1]
...
def x_n = l[n]
I would have to check in detail, but the access l[i] is not done
directly, it is done by using an iterator from l.
This means in your case "def (int a, int[] b) = [1, 2, 3, 4]" you
basically have this:
int a = 1
int[] b = 2
Groovy will then wrap the single value of 2, into an array for this
assignment.
As for rules for length. If the iterator does not provide enough
elements the assignment will fail with a runtime exception. Additional
elements from the iterator on the other hand are just ignored.
Frankly it is questionable if Groovy should really support that array
wrapping for "int[] b = 2", especially since something like "int[] b =
2,3" is not supported. But well... we have it atm.
bye blackdrag
--
Jochen "blackdrag" Theodorou
blog: http://blackdragsview.blogspot.com/
