Understand how to append slices in Golang
Every time we call an append function we are getting back a new slice. It might point to the same memory as the previous slice or it may point to a different piece of memory.
To understand how Go’s built-in append function works, let’s write our own function that emulates it’s behavior.
Append: https://golang.org/pkg/builtin/#append
More on Slices: https://www.ardanlabs.com/blog/2013/09/iterating-over-slices-in-go.html
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