Hitting f5 with no text selected, evals the current line.
It's eerily like the Acme editor. Write code snippets that do stuff in your editor O.o
Most of this code is taken from coffee-eval
Lines 1-7, written in coffeescript, are evaluated. They take the rest of the text in the editor and compile it to js. The js code is then selected and run. The result is an implementation of the classic 10PRINT program.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.