[ GroovyGN ] Multiple Assignments

Source From Here 
Since Groovy 1.6 we can define and assign values to several variables at once. This is especially useful when a method returns multiple values and we want to assign them to separate variables. 

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1. // Assign and declare variables.  
2. def (username, email) = ['mrhaki', 'email@host.com']  
3. assert 'mrhaki' == username  
4. assert 'email@host.com' == email  
5.   
6. // We can assign later than the definition of the variables.  
7. int housenr  
8. String streetname  
9. (streetname, housenr) = ['Old Street', 42]  
10. assert 42 == housenr  
11. assert 'Old Street' == streetname  
12.   
13. // We can also use type declerations.  
14. def (String streetName, int houseNumber) = ['Old Street', 42]  
15. assert 42 == houseNumber  
16. assert 'Old Street' == streetName  
17.   
18. // Return value of method can be assigned to multiple variables.  
19. def iAmHere() {  
20.     [29.20090, 12.90391]  
21. }  
22. def (coordX, coordY) = iAmHere()  
23. assert coordX == 29.20090  
24. assert coordY == 12.90391  
25.   
26. // More values than variables: extra values are ignored.  
27. def (a, b, c) = ['a', 'b', 'c', 'd']  
28. assert 'a' == a  
29. assert 'b' == b  
30. assert 'c' == c  
31.   
32. // Less values than variables: variable is not set.  
33. def (x, y, z) = [100, 200]  
34. assert 100 == x  
35. assert 200 == y  
36. assert !z  
37.   
38. // Useful for getting regular expressions matching groups.  
39. def money  = '12 Euro'   
40. def regexp = /(\d+) (\w+)/  
41. def (exp, amount, currency) = (money =~ regexp)[0]  
42. assert '12' == amount  
43. assert 'Euro' == currency  

Supplement 
* The Simple Groovy datatypes - Working with regular expressions