Groovy's Magic

method-pointer.groovy

def out = System.out.&println

out "Haaa!" //Haa

object-property.groovy

def data = [key1:'Value1', key2:'Value2']
def key = 'key2'

print data."$key" //output: value2

pow.groovy

//java
Integer n = 10;
List list = new ArrayList<Integer>();

for(int i=0; i<n; i++) {
  list.add(Math.pow(2, i));
}

System.out.println(list);
//output [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]

//groovy
(0..<10).collect { 2 ** it }
//output [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]

print-list.groovy

def test = [  
  [id:79, siteName:"Site 1"],
  [id:80, siteName:"Site 2"],
  [id:81, siteName:"Site 3"]
]

println test*.id << 78 //output: [79, 80, 81, 78]

range.groovy

//java
for(int i=-3; i<4; i++) {    
  System.out.println(i);
}

//groovy
(-3..3).each { print it }
//output -3-2-10123

('a'..'z').each { print it }
//output abcdefghijklmnopqrstuvwxyz

10.times {
  println "Valeu!"
}