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. 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). 13. The main idea here is that you can create your own custom interpolation methods to format strings. Check if variable is an Optional, and what type it wraps. Swift 3 incorrect string interpolation with implicitly unwrapped Optionals. This is also a requirement for the types used in string interpolation like this: "Integer value \(intVal) and double value \(doubleVal)" 3 * … Swift String Interpolation Example Read More » 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. Creating a custom string becomes easy with string interpolation. Question or problem in the Swift programming language: I can read an int, float, double as a string using string interpolation or String initializer. Swift String interpolation in 5 minutes : Interpolation is the process to insert variables, constants, expressions, and literals into a string. String Interpolation in Swift. Improving compiler performance with no real effort. We have string interpolation right? extension String. var a: Int = 2 var c: Character = "e" var d: String = "\(a)\(c)" OR var d: String = String(a) + String(c) the … Follow. Why 'if let' does not seem to unbox a value as before in Swift 3 in Xcode 8.3 beta?-1. Common use cases like printing JSON or optionals can make developing in Swift an even better experience. String interpolation is a way to construct new strings that contain constants, variables, literals, and expressions. "as My String into a series of statements similar to: If you're thinking about things like JavaScript doing "x" + array , the equivalent in Swift is "x\(array)" . Custom String interpolation. 0. Custom string interpolation allows you to further optimize working with strings in Swift. 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. It works with both single line and multiline strings. Overview. Great blog post about a simple example for the new String Interpolation use cases in Swift 5. As a general note, there is an important difference between string interpolation vs the Printable protocol. And I want to display which input(s) is used to compute the result in a detailed label of a table view cell. The Swift equivalent to what you're describing is string interpolation. I posted this post on our local iOS developer FB group. 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