liammclennan/JavaScript-Koans — pull request #27 by shosti (2013-07-29 20:06:45+00:00)
Title: Explicitly declare for..in vars

If there isn't an explicit `var` declaration for loop variables, a global variable is created. It doesn't make a difference for these examples, but since the koans are for learning it's probably a good idea to get people in the habit of explicitly declaring variables.