Swift Recipes: A Problem-Solution Approach

Chapter    4

Advanced Swift Programming

This chapter will cover more advanced recipes that you can use when creating applications using Swift. Recipes in this chapter will cover the following topics:

• Writing Closures
• Writing Trailing Closures
• Overloading the Equality Operator
• Checking for Reference Equality
• Implementing Generic Functions
• Implementing Generic Classes
• Working with Local Dates and Times
• Creating a Unit Test Project
• Writing a Unit Test
• Performance Testing with XCTest
• Creating Mock Objects for Testing
• Testing Asynchronous Code

4-1. Writing Closures

Problem

Your application needs to pass a function as a parameter to another function. For example, a method requires a callback function that is executed upon completion.

Solution ...