What are the differences between closures and functions in Swift?

What are the differences between closures and functions in Swift?

In Swift, functions are named blocks of code that can be called, while closures are unnamed and can capture variables from their surrounding context.

Can you give me an example of a closure in Swift?

Sure! Here's a simple closure that adds two numbers:

let add = { (a: Int, b: Int) -> Int in
    return a + b
}
print(add(3, 5)) // Output: 8

How do closures capture values?

Closures capture values by referencing the variables and constants from their surrounding context, allowing them to use those values even after the context has been destroyed.

Are there any performance differences between using closures and functions?

Yes, closures can be more efficient in certain scenarios, especially when used as inline callbacks, but they may have a slight overhead due to capturing context.