jquery/learn.jquery.com — pull request #439 by skskiran (2013-11-03 05:04:26+00:00)
Title: Update conditional-code.md

1. The non-existence of 'var foo;' issues an error (Uncaught ReferenceError: foo is not defined), in chrome, at 'if ( stuffToDo[ foo ] ) {'.
2. The code (without var foo;) works fine in Safari.
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Javascript Novice