Swift inline conditional?

var firstBool = true
var secondBool: Bool

firstBool == true ? (secondBool = true) : (secondBool = false)

If in this case, it changes the secondBool to whatever the firstBool is. You can do this with integers and strings too

You can use the new Nil-Coalescing Operator, introduced in Swift 3. It will return default value if someOptional is nil.

let someValue = someOptional ?? ""

Here, if someOptional is nil, this operator will assign "" to someValue.

It is called a "ternary operator".

With regards to @Esqarrouth's answer, I think a better format would be:

Swift 3:

var firstBool = true
var secondBool: Bool

secondBool = firstBool ? true : false

This is the same as:

var firstBool = true
var secondBool: Bool

if (firstBool == true) {
    secondBool = true
} else {
    secondBool = false
}

If you're looking for a one-liner to do that, you can pull the ?: operation out of the string interpolation and concatenate with + instead:

let fileExists = false // for example
println("something " + (fileExists ? "exists" : "does not exist"))

Outputs:

something does not exist

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