1. Closures can capture values from their surrounding context. This means that they can access variables and constants outside of their own scope, which can be extremely useful when working with asynchronous code or when you need to pass data between different parts of your code.
For example, consider the following code snippet that uses a closure to sort an array of integers:
2. Closures can be passed as arguments to functions. This means that you can write code that is more flexible and reusable, as you can pass different closures to a function depending on the specific task you want it to perform.
For example, consider the following code snippet that uses a closure to filter an array of strings:
3. Closures can be stored as variables or constants. This means that you can assign a closure to a variable or constant and then use that variable or constant whenever you need to execute the closure.
For example, consider the following code snippet that stores a closure as a variable and then uses it to transform an array of strings:
Similarly, we are creating a second closure as a variable called `lowercaseTransformer` and when passed to the map function as an argument, it transforms each word in the words array to lowercase.
Closures in Swift offer a more powerful and flexible alternative to functions, as they allow you to capture values from their surrounding context, pass them as arguments to functions, and store them as variables or constants. This makes them a valuable tool in any Swift developer's toolkit.