timeIt.groovy

def timeIt = { resultFormatter = { obj -> obj?.toString() }, closure ->
    def start = System.nanoTime()
    def result = null
    try {
        result = closure()
    } catch (Exception e) {
        result = e
    }
    def end = System.nanoTime()
    def ms = (end - start) / 1e6
    if (resultFormatter) {
        println "Result ${resultFormatter(result)} obtained in $ms ms"
    }
    [result, ms]
}
 
// Usage is simple
 
timeIt {
    1e12 + 1e12
} // prints 'Result 2E+12 obtained in 135.026656 ms'
 
def (sum, ms) = timeIt(null) {
    1e12 + 1e12
} // assigns the result of the closure to sum and the elapsed time to ms; null arg suppresses the println

def (sumIt, msIt) = timeIt{ obj -> obj?.toString() + " as " + obj?.getClass()} {
    1e12 + 1e12
} // assigns the result of the closure to sum and the elapsed time to ms; prints in the modified result fomat which also includes the class of the result