gistfile1.swift

// Write three functions that compute the sum of the numbers in a given list using a for-loop, a while-loop. 
// Part 2

var series = [1, 2, 3, 4, 5, 6]
let realSum = series.reduce(0,{$0 + $1})

// Normal Closure
var timesTenClosure: (Int) -> Int = { $0 * 10 }

// Problem 1 
// for-loop Part 2
func sum(from: Int, to: Int, closure: (Int) -> (Int)) -> Int {
    var sum = 0
    for i in series {
        sum += closure(i)
    }
    return sum
}

sum(from: 0, to: 10, closure: timesTenClosure)

// while-loop Part 2
func sum(from: Int, to: Int, closure: (Int) -> (Int)) -> Int {
    var whileLoopSum = 0
    var i = 0
    while i < series.count {
        whileLoopSum += series[i]
        i = i + 1
    }
    return whileLoopSum
}


sum(from: 0, to: 10, closure: timesTenClosure) 

// Trailing Closure Extremely Short Version
sum(from: 0, to: 10, closure: { $0 * 10 })