http://artsy.github.io/blog/2016/06/24/typealias-for-great-good/
TODO
Developers use typealias to create a new type identifier that’s a synonym for another type.
You can use typealias for most any type: classes, enums, structs, tuples, closures, etc.
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typealias Name = String typealias Employees = Array<Employee> typealias GridPoint = (Int, Int) typealias CompletionHandler = (ErrorType?) -> Void |
For example:
JWT is basically a base64 encoded string of JSON.
Clients don’t need to verify the JWT in order to use them, and in fact when Orta and I began using them, we treated them only as strings retrieved from one API and sent to another (like an access token). However, instead of using the String type, I decided to define a JWT type alias.
I used the new JWT type throughout the code as a hint to other developers about what kind of string it is. This gave it some semantic meaning on top of being a string. Neat. Only later, when we needed to start decoding the JWT itself did this really come in handy.