Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 

  • What is an Optional meant in Swift?

    @jasvinder.singh
    Recommendations Offline Message

    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 416
    Comment on it

    Hi Readers!

    An Optional is just an enum in Swift.

    enum Optional<T> {
    case None
    case Some(T)
}

    Here <T> is generic similar to an Array<T>

    <T> could be anything like Strings, Dictionary, Array etc.

    Here are some examples:

    Example 1:

     let a1 : String? = nil

    is similar to 

    let a1 = Optional<String>.None

    Example 2:

     let s2 : String? = "hello"

    is similar to 

    let s2 : String? = Optional<String>.Some("Hello")

    Example 3:

    let a : Array? = ["hello","hi"]

    is similar to

    let a = Optional.Some(["hello","hi"])

    I hope this explains what optionals are.

    swift Optional Optionals enumeration
    Comment on it

 0 Comment(s)

Sign In
Forgot Password?
                           OR                           
Create an account !!
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: