• Tips For Golfing In Groovy

Parsing

Converting strings to integers

x.toInteger()
x as Integer
x as int

Looping through list/string

for(a:args){a} // Java-style syntax; braces may be omitted if the body is only one statement
args.any{it} // Must return falsy value to keep iterating
args.min{it} // Sometimes useful for non-falsy values
args.each{it} // Most general iteration method, but rarely optimal

Looping through integers

10.times{}
for(n:0..9){} // better than .times when the variable is used at least twice and braces aren't needed
0.upto(10){}
(0..9).any{} // or any other list methods
0.step(10,2){} // loop with a step

Misc

• Eval - Eval.me(), or evaluate() to have access to current scope (Warning: slow)
• Short-circuiting is allowed: i%2||println(i)
• Regex matching: x.matches("...") -> x=~/.../
• Use spread-dot instead of collect to apply a method call to all elements in a collection: x*.multiply(2)

Packers

2:1

evaluate new String('...'.getBytes('UTF-16LE'))

# python
print('CODE'.encode().decode('utf-16le'))