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Searching for: Type Casting in Swift
Structures
Language: Swift
Structures are classes which are value-typed, similar to previous variables and lets. Structures, like classes, contain methods and properties.
Optionals
Language: Swift
In Swift, variables must have a value. Optionals are used to assign a value of nil to a variable, if no value is provided. Optional variables cannot have their values accessed directly. They need to be 'unwrapped' in order for the value to be used.