Functions and Methods in Go?

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The term "method" came up with object-oriented programming. In an OOP language (like C++ for example) you can define a "class" which encapsulates data and functions which belong together. Those functions inside a class are called "methods" and you need an instance of that class to call such a method.
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type MyInteger int
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func (a MyInteger) MyMethod(b int) int {
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  return a + b
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}
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// Usage:
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// var x MyInteger = 1
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// x.MyMethod(2)
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Ref: https://stackoverflow.com/a/8263702 
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​There are two ways of defining them. If you want to modify the receiver use a pointer like:
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func (s *MyStruct) pointerMethod() { } // method on pointer
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If you dont need to modify the receiver you can define the receiver as a value like:
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func (s MyStruct)  valueMethod()   { } // method on value
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Ref: https://stackoverflow.com/a/34350336 

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