Let's understand this by means of an example. For example, the Scale method here is defined on *Vertex.. Methods with pointer receivers can modify the value to which the receiver points (as Scale does here). It is perfectly legal for a function to return a pointer of a local variable. A method call x.m() is valid if the method set of (the type of) x contains m and the argument list can be assigned to the parameter list of m. If x is addressable and &x’s method set contains m, x.m() is shorthand for (&x).m() This leads to emergent behavior depending on how you define the method, and in particular, the method receiver. ... Function in Golang- Complete Guide. You can declare methods with pointer receivers. Describing a pointer: * In a function signature or type definition, the * is used to designate that a value is a pointer. Dereferencing a pointer: * It can be slightly confusing, but the * is used to describe a pointer and it is also used as an operator to dereference a pointer. I will try to make it as clear as possible . This topic trips most go newbies. When a function has a value argument, it will accept only a value argument. This program outputs, value of a before function call is 58 value of a after function call is 55 Returning pointer from a function. Using pointers inside functions makes the value mutable unless its const. Golang interface method – pointer receiver or value receiver Recently I have been working with Golang interface. 2. Pointer receivers. Whatever you pass, can be mutated (as long as it is mutuable). Methods and interfaces. Passing the address of variable to the function and the value of a variables modified using dereferencing inside body of function. There are lots of confusions on how to use interface in Golang, particularly how to implement the methods in interface. A method of a type can either have a pointer receiver or a value receiver. Value receivers in methods vs Value arguments in functions. There is a caveat while pointer vs value receiver for methods of a type when that type implements an interface. So, whenever we want to change a value we should use a pointer to that as function argument and then do necessary modifications. Prerequisite: Pointers in Go Pointers in Go programming language or Golang is a variable which is used to store the memory address of another variable. This means the receiver type has the literal syntax *T for some type T. (Also, T cannot itself be a pointer such as *int.) The “new” function in Go. func passPointer(pointer *string) { } 3. 8. When a method has a value receiver, it will accept both pointer and value receivers. The object inside a function is the same as the caller object. Function values; Function closures; Exercise: Fibonacci closure; Congratulations! 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