The ternary operator allows you to run a check and return one of two values depending on the result of that check – it has the name “ternary” because it works with three values rather than two or one like other operators. You’ll often see it written as
?: but in practice the
: are used separately.
Like I said, the ternary operator is used with three values: the check to run, what to return if the check is true, and what to return if the check is false. For example, if we had a
score constant that contained an integer, we could make a
result constant equal either to “Pass” or “Fail” depending on the value of
let score = 88 let result = score > 85 ? "Pass" : "Fail"
You can read that ternary as “if score is greater than 85 return Pass otherwise return Fail.” Because
score was set to 88,
result will be set to Pass.
The ternary operator usually makes your code harder to read and understand, so it doesn’t get much use.
Available from iOS 8.0
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Want to build macOS apps?
Hacking with macOS delivers 18 awesome projects that teach you macOS development in no time – take control of your desktop today!