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Book Overview & Buying
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Table Of Contents
Mastering Swift 6 - Seventh Edition
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Key paths are powerful tools that allow us to access and manipulate properties in a type-safe, concise manner. They also provide a way to reference properties without using string literals, as we did with dynamic member lookup, which can be error-prone and difficult to maintain. Let’s take a quick look at key paths to understand how we can use them.
A key path is a type-safe reference to a property of a type. It is represented by the KeyPath type, which is a generic type that includes two type parameters: the root type and the property type. They are defined using the \ syntax followed by the type and the property path. Let’s look at a very basic example:
struct BasketballTeam {
var city: String
var nickName: String
}
let cityKeyPath = \BasketballTeam.city
In this example, we created a BasketballTeam structure and then created a cityKeyPath key path, which is an instance of KeyPathType that represents the city...