Type methods
A type method is a function that is attached to a specific data type. Although type methods (or methods on types) are functions, in reality, they are defined and used in a slightly different way.
The methods on types feature gives some object-oriented capabilities to Go, which is very handy, and it’s used extensively in Go. Additionally, interfaces require type methods to work.
Defining new type methods is as simple as creating new functions, provided that you follow certain rules that associate the function with a data type.
Creating type methods
So, imagine that you want to do calculations with 2x2 matrices. A very natural way of implementing that is by defining a new data type and defining type methods for adding, subtracting, and multiplying 2x2 matrices using that new data type. To make it even more interesting and generic, we are going to create a command line utility that accepts the elements of two 2x2 matrices as command line...
