Expertise in Combine

We already discussed declarative programming throughout this chapter, so now, let’s focus on the Combine framework for a second.

Apple introduced Combine in WWDC 2019 as part of the iOS 13 version. Combine is Apple’s response to other popular reactive frameworks, such as React and RxSwift.

The Combine framework helps developers build reactive applications with robust async operations and data updates.

There are three main components in Combine:

• Publishers: A publisher is an object that emits a stream of values over time. Publishers can be thought of as a source of data, which can come from various sources, such as user input, network requests, or timers. Publishers can emit values of different types, such as integers, strings, or custom data types, and can emit an unlimited number of values or a finite number of values.
• Operators: Operators are functions that can be used to transform, filter, or combine streams of values emitted...