eval javascript line by line

Given a string of javascript code, returns the result of running the code line-by-line.

var incr = require('incremental-eval');
incr('a = 2'); // [2] 
incr('a = 2\n a * 2'); // [2, 4] 
// supports modifying the scope with with 
incr('a', { a: 2 }); // [2] 

Takes a piece of Javascript code, as a string, and returns an array of results per-line. If a line does not return results, it is in the array as null.

The second argument can be an object that is supplied to with, so that you can change the scope of the eval