Example of how to use .reduce in Swift 3

ReduceExample.swift

//: Playground - noun: a place where people can play

import UIKit

var str = "Hello, playground"

struct ChartItem {
    var label: String = ""
    var value: CGFloat = 0.0
}

let data = [ChartItem(label: "one", value: 350.0),
            ChartItem(label: "two", value: 1310.0),
            ChartItem(label: "two", value: 750.0),
            ChartItem(label: "three", value: 890.0),
            ChartItem(label: "two", value: 230.0)]

let maxBaseHeight = data.reduce(0.0, { (total, item) -> CGFloat in
    max(total, item.value)
})

print("maxBaseHeight: \(maxBaseHeight)")