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//
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//  TipCalculatorModel.swift
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//  TipCalculator
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//
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//  Created by Main Account on 12/18/14.
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//  Copyright (c) 2014 Razeware LLC. All rights reserved.
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//
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​
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import Foundation
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​
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class TipCalculatorModel {
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​
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  var total: Double
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  var taxPct: Double
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  var subtotal: Double {
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    get {
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      return total / (taxPct + 1)
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    }
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  }
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​
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  init(total: Double, taxPct: Double) {
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    self.total = total
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    self.taxPct = taxPct
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  }
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​
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  func calcTipWithTipPct(tipPct: Double) -> Double {
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    return subtotal * tipPct
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  }
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​
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  func returnPossibleTips() -> [Int: Double] {
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​
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    let possibleTipsInferred = [0.15, 0.18, 0.20]
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    let possibleTipsExplicit:[Double] = [0.15, 0.18, 0.20]
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​
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    var retval = [Int: Double]()
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    for possibleTip in possibleTipsInferred {
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      let intPct = Int(possibleTip*100)
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      retval[intPct] = calcTipWithTipPct(possibleTip)
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    }
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    return retval
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​
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  }
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​
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}
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​

A simple mode for Swift

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