Finished

CurrencyConverter.playground/Contents.swift

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+import UIKit
+
+//The goal of today's module project is to create a Currency Conversion playground that can convert from US dollars (USD) to Canadian dollars (CAD) and Mexican Pesos (MXN).
+//
+//Get the currency conversion value from Google:
+
+
+// 1. Create a currency type enum below the `import` statements.
+
+
+enum Currency {
+    case cad
+    case mxn
+}
+
+
+//  2. Create a constant called `usToCad` and set its value to the current conversion value (googling `usd to cad` should give you the value). Do the same for a new constant called `usToMxn`.
+
+let usToCad = 1.4
+let usToMxn = 23.87
+
+// 3. Create a property named `currency` of type `Currency`. This will store the current currency type we'll be converting to. Set an initial value of `.cad`.
+
+let usCad = Currency.cad
+let usMxn = Currency.mxn
+
+var currency: Currency = .cad
+
+// 4. Create a helper method to calculate the currency based on the Currency using the method signature:
+//```swift```
+
+func convert(us: Double) -> Double {
+    switch currency {
+    case .cad:
+        return us * usToCad
+    case .mxn:
+        return us * usToMxn
+    }
+}
+
+/* 5. In the above method:
+* Check the value of `currency` to see whether you should convert to CAD or MXN
+* Perform the conversion with the dollars passed into this method
+* Return the converted value */
+
+
+
+
+
+
+
+/*  6. Create a function called `convert(amountString: String) -> String?` In it, do the following:
+* create a constant called `amount`. Its value should be the `amountString` that is initialized into a `Double`
+* use a `guard let` to unwrap the new `amount` constant.
+* convert the dollar amount to the expected currency (hint, you'll want to call the `convert` method you created in step 4 */
+
+func convert2(amountString: String) -> String? {
+    let amount = amountString
+    let amountConversion = Double(amount)
+    guard let unwrappedAmount = amountConversion else {
+        return "error"
+    }
+    return("Converted Currency: \(convert(us: unwrappedAmount))")
+}
+
+
+
+/* 7. Test your code by calling `convert(amountString` with some values. Change your `currency` to both `.cad` and `.mxn` (by manually changing the value of your `currency` variable above) to make sure the conversion works for both currencies.
+ */
+
+
+convert2(amountString: "11.00")
+currency = .cad
+convert(us: 16.00)
+convert2(amountString: "16.00")
+
+
+
+/* ## Go Further (Optional)
+
+1. Customize the output using a `NumberFormatter`
+
+    ```swift
+    var currencyFormatter: NumberFormatter = {
+        let formatter = NumberFormatter()
+        formatter.numberStyle = .currency
+        return formatter
+    }()
+    ```
+
+2. Use the `string(from:)` method to convert from a number to a String for display*/

CurrencyConverter.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

CurrencyConverter.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>