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Browse - programming tips - javascript warnings about undeclared variables

Date: 2009jul26
Language: javaScript

Q.  How do I get warnings about undeclared variables in javaScript?

A.  In Firefox, go to

	about:config

And set

	javascript.options.strict = true

This is like perl's "use strict;".
It also, helpfully, warns about variables with overlaping scope.
Since this generates lots of warning from things I don't control
(eg jQuery).  I prefer to just turn it on occasionally.

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