More advanced String interpolation?

Hi,


I'm new to Swift from an Objective-C background.


I'm confused about string interpolation. All of the examples I've ever seen, as well as all of the instances in existing code that I have read, look like this:

"I have \(dollars) dollars"


In Objective-C, as well as c++ and other languages, we use format specifiers to describe how we want variables to appear inside a string. For numbers, I can specify things like number of decimal places, zero padding, or the desired numerical base. How is this done in Swift?


Thanks,
Frank

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No simple way. You may need to embed an expression which creates a formatted String like:

"I have \(String(format: "%4.2f", dollars)) dollars"


Or, if you do not insist on using String interpolation, this may be preferred:

String(format: "I have %4.2f dollars", dollars)


If you want to propose a new feature for Swift String interpolation, swift.org would be the better place.

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