There is kind of a debate on this topic, some say that there is a crucial difference between them and others say there is no difference, in this article we'll examine the two points of view and their arguments in order to have a conclusion at the end. 


The reasons why we would say that they are different could be : 

  • a method is an object while a function is independent of any object or class, for example in java and c# there are no functions, while in c there are only functions, to simplify this we can say that:
    • a function is a feature or functionality
    • a method is one way of doing something (therefore it has different approaches..)
  • functions are defined outside of a class, while methods are defined inside a class...

the reasons why we would say they are the same are : 

  • in the OO world, the two are commonly used to mean the same thing, From a pure Math and CS perspective, a function will always return the same result when called with the same arguments ( f(x,y) = (x + y) ). A method, on the other hand, is typically associated with an instance of a class. Again though, most modern OO languages no longer use the term "function" for the most part. Many static methods can be quite like functions, as they typically have no state

  • 'method' is the object-oriented word for 'function'. That's pretty much all there is to it (ie., no real difference).


conclusion : 


actually, to determine whether there is a difference or not, we should refer to the context that we're talking about within it, so there is no absolute answer to this question 











sources : 

1 - https://stackoverflow.com/questions/155609/whats-the-difference-between-a-method-and-a-function



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