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amlcurran/swift-optional-1.swift

Created July 28, 2016 21:18
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swift-optional-1.swift
var string: String = "hello"
string = nil // fails to compile - trying to assign nil to a non-optional value
var optionalString: String? = "hello"
optionalString = nil // compiles fine, as we've declared this to be an optional string
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