If you are coming from java, finding the average of a collection of numbers has various flavors using java 8, guava and apache commons. Each has a method which you pass a collection that calculate internally and pass back the average. In groovy, there isn't a method which is left desired for java converts looking for traditional way. Below we show two snippets that show how to calculate the average or mean of a list of numbers using groovy. In both instances, we will call the sum of an arraylist and then divide by the size.
Find average from list
@Test
void average_with_groovy() {
def numbers = [1, 2, 3, 4]
def average = numbers.sum() / numbers.size()
assertEquals 2.5, average
}Find average with a method
def findAverage(list) { list.sum() / list.size() }
@Test
void average_with_groovy_call_method() {
def numbers = [1, 2, 3, 4]
assertEquals 2.5, average(numbers)
}