Homework 1

import UIKit

// Assuming this is the values, not the even indexes
func sumOfEvens(array: [Int]) -> Int
{
    var total = 0
    for value in array
    {
        if value % 2 == 0
        {
            total += value
        }
    }
    return total
}

func rangeArray(x: Int, y: Int) -> [Int]
{
    var total = [Int]()
    if x > y
    {
        return total
    }
    for index in x...y
    {
        total.append(index)
    }
    return total
    
}

func averages(array: [Double]) -> (mean: Double, median: Double, mode: Double)
{
    var mean = 0.0
    var median = 0.0
    var mode = 0.0
    
    var sortedArray = array
    sortedArray.sort()
    
    median = sortedArray[ sortedArray.count / 2 ]
    var counts = [Double: Int]()
    
    for value in sortedArray
    {
        switch counts[value]
        {
            case nil:
                counts[value] = 0
            default:
                counts[value] = counts[value] != nil ?? counts[value] + 1 : 0
        }

        mean += value
    }
    mean = mean / Double(sortedArray.count)
    
    var highest = 0
    for (item, amount) in counts
    {
        if amount > highest
        {
            mode = item
            highest = amount
        }
    }
}

var mySums = sumOfEvens(array: [12, 4, 3, 5, 4, 6, 9, 7, 17, 13])
print(mySums)
mySums = sumOfEvens(array: [1, 5, 9, 13, 11, 7, 9, 3])
print(mySums)
mySums = sumOfEvens(array: [8, 4, 6, 8, 4, 6, 4, 6, 8])
print(mySums)
mySums = sumOfEvens(array: [1])
print(mySums)
mySums = sumOfEvens(array: [2])
print(mySums)
mySums = sumOfEvens(array: [])
print(mySums)

var myArrays = rangeArray(x: 12,y: 17)
print(myArrays)
myArrays = rangeArray(x: -2,y: 7)
print(myArrays)
myArrays = rangeArray(x: 12,y: 12)
print(myArrays)
myArrays = rangeArray(x: 17,y: 12)
print(myArrays)
myArrays = rangeArray(x: -2,y: -4)
print(myArrays)
myArrays = rangeArray(x: 0,y: 0)
print(myArrays)