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Daily Challenge #109 - Decorate with Wallpaper

dev.to staff on November 06, 2019

John wants to decorate his room with wallpaper. He's heard that having the right amount of wallpaper can be trickier than it sounds. He'd like a fo...
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kesprit • • Edited

My solution in Swift, I check if one parameter equal to 0.0 so it's not a room and then calculate each wall :

func wallpaper(length: Double, width: Double, height: Double) -> String {

    let numberOfRolls = [0: "zero",
               1: "one",
               2: "two",
               3: "three",
               4: "four",
               5: "five",
               6: "six",
               7: "seven",
               8: "eight",
               9: "nine",
               10: "ten",
               11: "eleven",
               12: "twelve",
               13: "thirteen",
               14: "fourteen",
               15: "fiveteen",
               16: "sixteen",
               17: "seventeen",
               18: "eighteen",
               19: "nineteen",
               20: "twenty"
    ]

    guard length != 0.0 && width != 0.0 && height != 0.0 else {
        return numberOfRolls[0]!
    }

    var amount = 0.0
    [length, width].forEach {
        amount += (($0 / 0.52) / ( 10.0 / height)) * 2
    }
    let total = Int((amount * 1.15).rounded(.up))

    return numberOfRolls[total] ?? numberOfRolls[0]!
}

wallpaper(length: 0.0, width: 3.5, height: 3.0)
wallpaper(length: 4.0, width: 3.5, height: 3.0)
wallpaper(length: 6.3, width: 4.5, height: 3.29)
wallpaper(length: 7.8, width: 2.9, height: 3.29)
wallpaper(length: 6.3, width: 5.8, height: 3.13)
wallpaper(length: 6.1, width: 6.7, height: 2.81)
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Shannon Crabill •

Why the double at the beginning?

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kesprit •

To avoid cast during the calculation but it's true I could use Float too.