reduce
reduce is a functional method that returns the result of combining the elements of a sequence using a given closure. It takes in two parameters:
- An initial value
- A closure to produce the next result
reduce an array of Ints
let numbers = [1, 2, 3, 4]
let numbersSum = numbers.reduce(0) {
$0 + $1
}
let numbersProduct = numbers.reduce(1) {
$0 * $1
}
print(numbersSum) // 10
print(numbersProduct) // 24
The example above can be shortened to the following:
let numbers = [1, 2, 3, 4]
let numbersSum = numbers.reduce(0, +)
let numbersProduct = numbers.reduce(1, *)
print(numbersSum) // 10
print(numbersProduct) // 24
