Groovy: List: sum(): Return sum of all the elements in the list

Groovy provides sum() method, it return the sum of all the elements in a list. It internally uses ‘+’ operator to perform the sum.

‘sum’ method is available in below overloaded forms.

public Object sum()

public Object sum(Object initialValue)

public Object sum(Closure closure)

public Object sum(Object initialValue, Closure closure)

HelloWorld.groovy

numbers = [0, 1, 2, 3, 4, 5]

def sumOfElements = numbers.sum()

println "sumOfElements : ${sumOfElements}"

Output

sumOfElements : 15

You can even provide initial value while calculating the sum.

HelloWorld.groovy

numbers = [0, 1, 2, 3, 4, 5]

def sumOfElements = numbers.sum(100)

println "sumOfElements : ${sumOfElements}"

Output

sumOfElements : 115

You can even provide a closure the sum method.

HelloWorld.groovy

numbers = [0, 1, 2, 3, 4, 5]

def sumOfElements = numbers.sum()
def sumOfSquaresOfElements = numbers.sum {it * it}

println "sumOfElements : ${sumOfElements}"
println "sumOfSquaresOfElements : ${sumOfSquaresOfElements}"

Output

sumOfElements : 15

sumOfSquaresOfElements : 55

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