Abstract
In situations where you can’t be sure a variable has a value present, you can use optionals. An optional is a variable that can have either an assigned value or no value at all. Using optionals is an alternative to setting objects to nil. Optionals can be used with any type in Swift including numbers, strings, and objects.
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© 2014 Matthew Campbell
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Campbell, M. (2014). Optionals. In: Swift Quick Syntax Reference. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-0439-9_9
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DOI: https://doi.org/10.1007/978-1-4842-0439-9_9
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Publisher Name: Apress, Berkeley, CA
Print ISBN: 978-1-4842-0440-5
Online ISBN: 978-1-4842-0439-9
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