Discussion on: Daily Challenge #4 - Checkbook Balancing

[kespri]

My solution in Swift :

/// Daily Challenge #4 - Checkbook Balancing

let checkbook = """
1233.00
125 Hardware;! 24.8?;
123 Flowers 93.5
127 Meat 120.90
120 Picture 34.00
124 Gasoline 11.00
123 Photos;! 71.4?;
122 Picture 93.5
132 Tires;! 19.00,?;
129 Stamps 13.6
129 Fruits{} 17.6
129 Market;! 128.00?;
121 Gasoline;! 13.6?;
"""

func analyseCheckbook(checkbook: String) {
    typealias CheckbookEntry = (number: String, description: String, expense: Double)
    let roundFormat = "%.2f"
    var count: Double = 0
    var totalExpense: Double = 0
    var checkbookEntries = [CheckbookEntry]()

    var cleanCheckbook = checkbook.filter { char -> Bool in
        char.isLetter || char.isNumber || char.isWhitespace || char == "."
    }.components(separatedBy: .newlines)

    let originalBalance = Double(cleanCheckbook.removeFirst()) ?? 0
    cleanCheckbook.forEach { checkbook in
        let line = checkbook.components(separatedBy: .whitespaces)
        if line.count == 3 {
            checkbookEntries.append(CheckbookEntry(number: line[0], description: line[1], expense: Double(line[2]) ?? 0))
        }
    }

    print("Original_Balance: \(originalBalance)")

    checkbookEntries.forEach { entry in
        count += entry.expense
        totalExpense += entry.expense
        print("\(entry.number) \(entry.description) Balance \(String(format: roundFormat, originalBalance - count))")
    }
    let averageExpense = (totalExpense / Double(checkbookEntries.count))
    print("Total expense \(String(format: roundFormat, totalExpense))")
    print("Average expense \(String(format: roundFormat, averageExpense))")
}