Custom String interpolation. I'll show you a working example real quick. Check if variable is an Optional, and what type it wraps. String Interpolation in Swift. result is always the same. And I want to display which input(s) is used to compute the result in a detailed label of a table view cell. We have string interpolation right? 3 * … Swift String Interpolation Example Read More » Follow. var a: Int = 2 var c: Character = "e" var d: String = "\(a)\(c)" OR var d: String = String(a) + String(c) the … This is a more advanced topic, but I believe that not so many people are aware of this function in Swift, so let's talk a little bit about it. The Swift equivalent to what you're describing is string interpolation. My app is kind of related to maths. The main idea here is that you can create your own custom interpolation methods to format strings. Improving compiler performance with no real effort. Swift String interpolation in 5 minutes : Interpolation is the process to insert variables, constants, expressions, and literals into a string. 0. If you're thinking about things like JavaScript doing "x" + array , the equivalent in Swift is "x\(array)" . extension String. 13. Question or problem in the Swift programming language: I can read an int, float, double as a string using string interpolation or String initializer. String interpolation is a way to construct new strings that contain constants, variables, literals, and expressions. Creating a custom string becomes easy with string interpolation. I posted this post on our local iOS developer FB group. Custom string interpolation allows you to further optimize working with strings in Swift. Great blog post about a simple example for the new String Interpolation use cases in Swift 5. Common use cases like printing JSON or optionals can make developing in Swift an even better experience. However I saw a comment in the code example in the SE saying that we shouldn’t call `appendLiteral` method directly but I see you call it in your appendInterpolation method implementation. Swift 3 incorrect string interpolation with implicitly unwrapped Optionals. As a general note, there is an important difference between string interpolation vs the Printable protocol. Each Expressible By String Interpolation type has an associated String Interpolation type which conforms to String Interpolation Protocol.Swift converts an expression like "The time is \(time). Each entry of the string literal you inserted is wrapped in parentheses prefixed by a backslash: let x = 3 let str = "\\(x) * 5 = \\(Double(x) * 5)" print(str) Below is above code execution result. It works with both single line and multiline strings. For example ... You can use %@ in Swift's String(format:...), it can be substituted by a Swift String or any instance of a NSObject subclass. 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