To add, here's a nice article on implementing map from scratch: https://blog.burntsushi.net/type-parametric-functions-golang/ https://blog.burntsushi.net/type-p

To add, here's a nice article on implementing map from scratch: https://blog.burntsushi.net/type-parametric-functions-golang/ https://blog.burntsushi.net/type-parametric-functions-golang... It illustrates what you have to pay to get this kind of functionality for arbitrary slices. I wonder how this would change with generics.