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- // Non-optional vars
- var mutableBeverage = "Leffe"
- println(mutableBeverage) // "Leffe"
- mutableBeverage = "Bud"
- println(mutableBeverage) // "Bud"
- mutableBeverage = mutableBeverage + "weiser"
- println(mutableBeverage) // "Budweiser"
- mutableBeverage = nil // Compiler error
- // Optional vars
- var mutableCostume: String? = "Dracula"
- println(mutableCostume) // Optional("Dracula")
- mutableCostume = "Frankenstein"
- println(mutableCostume) // Optional("Frankenstein")
- mutableCostume = "Bride of " + mutableCostume!
- println(mutableCostume) // Optional("Bride of Frankenstein")
- mutableCostume = nil // nil
- // Non-optional lets
- let immutableBeverage = "Bud"
- println(immutableBeverage) // "Bud"
- immutableBeverage = "Leffe" // Compiler error
- immutableBeverage = immutableBeverage + "weiser" // Compiler error
- immutableBeverage = nil // Compiler error
- // Optional lets
- let immutableCostume: String? = "Dracula"
- println(immutableCostume) // Optional("Dracula")
- immutableCostume = "Frankenstein" // Compiler error
- immutableCostume = "Bride of " + immutableName! // Compiler error
- immutableCostume = nil // Compiler error
- let anotherCostume: String? = nil
- println(anotherCostume) // nil
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