Swift Functional Programming - Second Edition

Sum and product of an array

We can use our reduce function to calculate the sum of a list of numbers as follows:

let listOfNumbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] let sumOfNumbers = reduce(elements: listOfNumbers, initial: 0, combine: +) print(sumOfNumbers) 

The result will be 55, as expected.

We can use our reduce function to calculate the product of array values as follows:

let productOfNumbers = reduce(elements: listOfNumbers, initial: 1,combine: *) print(productOfNumbers) 

The result is going to be 3628800, as expected.