What are the differences between functions and methods in Swift?

Question

I always thought functions and methods were the same, until I was learning Swift through the \"Swift Programming Language\" eBook. I found out that I cannot use greet(

Answer 1

Here is a simple answer on the difference between functions and methods:

Some folks use “function” and “method” interchangeably, but there’s a small difference: both of them are reusable chunks of code, but methods belong to classes, structs, and enums, whereas functions do not.

So:

func thisIsAFunction() {
}

struct Person {
    func thisIsAMethod() {
    }
}

Because methods always belong to a data type, they have a concept of self that functions do not.

source: https://www.hackingwithswift.com/example-code/language/whats-the-difference-between-a-function-and-a-method