Code used in our Swift Playgrounds lecture

SwiftClosures.swift

var values = [10, 5, 2, 8, 3, 6, 1, 1000]

// Verbose Closure
var numValuesOver5 = values.reduce(0, combine: {(runningTotal : Int, currentValue : Int) -> Int in
    return currentValue > 5 ? runningTotal + 1 : runningTotal
})

// Closure parameter name shorthand and trailing closure
var numValuesOver9 = values.reduce(0) {
    return $1 > 9 ? $0 + 1 : $0
}

// A Closure using a closure for a variable
func numValuesOverLimit(values : [Int], #limit : Int) -> Int {
    return values.reduce(0) {
        return $1 > limit ? $0 + 1 : $0
    }
}

numValuesOverLimit(values, limit: 5)
numValuesOverLimit(values, limit: 9)