reidev/js-style-guide — pull request #7 by robatron (2014-06-06 20:04:19+00:00)
Title: Proposal: Add guideline to always initialize unassigned variables with `null`

This distinguishes declared but, unassigned variables from `undefined` variables. E.g., given the declaration `var foo;`, a reference `foo`, a typo `fo0`, or any variable that does not exist all evaluate to `undefined`.