Swift-style-guide: ID vs Id vs Identifier

[jackwu95]

Examples:

var userID
var userId
var userIdentifier

I struggle with this about once per project and I don't see many discussions on it.

I think it's _always_ a special case and as long as it's consistent within a project I try not to think about it too much.

However, would love to hear how others think and if there's _any_ logical advantage to any one of these options over the others.

[ghost]

Apple appears to be favoring the identifier suffix, over the prior ID suffix.

Personally, I'm not a fan of the Id suffix.

[chupakabr]

I used to use camel case for abbreviations, so Id works for me. but if it's in the end of the name of a variable then ID is more readable i think

[jawwad]

Apple does use the "Identifier" suffix ex reuseIdentifier, eventIdentifier and when abbreviating Apple uses the uppercase "ID", for example NSManagedObject has an objectID, CKNotification has a notificationID and subscriptionID, CKRecord has a createrUserRecordID etc.

[mitchellporter]

I tend to stick with what @jawwad posted.

[rayfix]

@jawwad is correct. userID (The Dropbox SDK gets it wrong. :] )

Generally acronyms should be avoided but, The Apple API Design Guide says:

Acronyms and initialisms that commonly appear as all upper case in American English should be uniformly up- or down-cased according to case conventions:

var utf8Bytes: [UTF8.CodeUnit]
var isRepresentableAsASCII = true
var userSMTPServer: SecureSMTPServer

[rayfix]

Will include mention under naming.