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----
-title: "Go's unique pkg"
-tags: posts
-toc: true
----
-
-https://pkg.go.dev/unique
->The unique package provides facilities for canonicalising ("interning") comparable values.[^1]
-[^1]: https://pkg.go.dev/unique
-
-oh yeah, thats obvious I fully understand what this package does now, great read, tune in for the next post.
-
-Interning, is the re-use of an object of equal value instead of creating a new one. I'm pretending I knew this but really I've just reworded [Interning](https://en.wikipedia.org/wiki/Interning_(computer_science)). 
-
-So lets try again.
-
-If you're parsing out a csv of bank transactions, its very likely a lot of names will be repeated. Instead of allocating memory for each string representing a merchant, you can simply reuse the the same string.
-
-So the dumbed down version might look like
-```go
-var internedStrings sync.Map
-
-func Intern(s string) string {
-	if val, ok := internedStrings.Load(s); ok { 
-		return val.(string) 
-	} 
-	internedStrings.Store(s, s) 
-	return s 
-}
-```
-With a small demo here https://go.dev/play/p/piSYjCHIcLr
-
-This implementation is fairly naive, it can only grow and it only works with strings, so naturally go's implementation is a better. 
-
-It's also worth noting, that since strings are a pointer under the hood
->When comparing two strings, if the pointers are not equal, then we must compare their contents to determine equality. But if we know that two strings are canonicalized, then it _is_ sufficient to just check their pointers.[^2]
-[^2]: https://go.dev/blog/unique
-
-So to recap, goes `unique` package provides a way to reuse objects instead of creating new ones, if we consider the objects of equal value.