In ES5+, the global `undefined` is immutable, so it should be pretty safe unless... | Hacker News

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		kevincennis on July 10, 2015 \| parent \| context \| favorite \| on: Don't use \|\| to set default values in JavaScript In ES5+, the global `undefined` is immutable, so it should be pretty safe unless someone declared a local `undefined` var in an outer scope.

arnehormann on July 10, 2015 [–]

I use "var undef;" at the top of a function and never set it to a value. Comparison with === is the same as with undefined. And it's nice for minification.

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