Anantprakash Pathak highlighted you must always use var to declare ...

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Anantprakash Pathak thinks this is interesting:

you must always use var to declare local variables.

From

Cover of JavaScript: The Definitive Guide, 6th Edition

Variable Scope
from JavaScript: The Definitive Guide, 6th Edition
by David Flanagan
Publisher: O'Reilly Media, Inc.
Released: May 2011

Note

** If you don't make variables in a Fun as var they will be declared as global variables.

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