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iOS Solution: Thinking About Types

Why don't I have to use the \() to interpolate?

In the Thinking About Types excercise within the Manipulating Data practice sessions there is code similar to the following:

var isReady = true isReady = false

let value = 10 let valueTimesThree = value * 3

let name = "Pasan" let lastName = "Premaratne"

In the second section, I would assume that in order to use the value constant within the valueTimesThree constant I would have had to write it like this, 'backslash'(value). Why don't I need to do this?

1 Answer

28,538 Points

The \() syntax is used to insert a variable within a string, it makes it clear to Swift that you are referencing a variable and not just typing normal text. Outside of strings that distinction is not needed, as Swift assumes that all words typed is either a keyword, variable or something similar.

That means that whenever you want to reference a variable outside a string you simply have to type its name, nothing more. This is true regardless of whether the variable is used in a math operation, passed to a function or pretty much anything else.