Learning Golang (some rough notes) - S01E04 - Function Closures

#go #learning

So far the Tour has been 🤔 and 🧐 and even 🤨 but function closures had me 🤯 …

Each of the words on the page made sense but strung together in a sentence didn’t really make any sense to me.

Google resources threw up some nice explanations:

https://gobyexample.com/closures

I like this site as it links all its examples to The Go Playground where you can try out each code block
http://tleyden.github.io/blog/2016/12/20/understanding-function-closures-in-go/

This comment was particularly useful

Essentially you can think of them like stateful functions , in the sense that they encapsulate state.

It made things click a bit for me, more than the abstract alphabet soup that other examples used :)

This one gets into some more hands-on examples

It also acted as a spoiler for the function closure exercise since that was the first example it gives :)

func fibonacci() func() int {
    f1 := 1
    f2 := 0
    return func() int {
        f1,f2 = f2, (f1+f2)
        return f1
    }
}

I tweaked the version that I’d seen so that the return values stated at zero

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