Also...
> Higher order functions ... no mainstream languages that don’t do this.
Go doesn't, vehemently so. A higher order function, such as map, must be generic, and Go simply doesn't see the need for that. Write more for loops :(
We seem to have a different notion of what a higher order function is. My understanding is that a higher order function is one that takes one or more functions as arguments, or, returns one or more functions as a result.
Go happily supports this.
Go does not support higher order functions in nearly the same way as functional languages.
Isn't that an editor's job?