Correct: `Array.from()` (it’s a static method)
Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method)
This patch uses the common `#` syntax to denote `.prototype.`.
Probably being pernickety. But if we're using ES6, you could just use a template litoral instead of string concat? Not sure if the litoral version is a bit more difficult to read mind you.
