Learn Go Programming: The Zoo of Go Functions
https://blog.learngoprogramming.com/go-functions-overview-anonymous-closures-higher-order-deferred-concurrent-6799008dde7b?gi=a15f60f8af16
https://blog.learngoprogramming.com/go-functions-overview-anonymous-closures-higher-order-deferred-concurrent-6799008dde7b?gi=a15f60f8af16