groovy Groovy Truth (true-ness) Closure evaluation
Example
The evaluation of a closure is the evaluation of the result of the closure.
All rules applies : if the closure returns a null , zero number or empty String, Collection, Map or Array it evaluates to false otherwise to true.
// Closure return non zero number => true
assert { 42 }()
// closure returns 0 => false
assert ! ( { 0 }())
// closure returns null => false
assert !( { }())
