`null` and default arguments

Brendan Eich brendan at mozilla.org
Mon Aug 17 21:16:09 UTC 2015

and surrounding thread.


Isiah Meadows wrote:
> I know it's a little late for this, but what was the rationale of 
> using only `undefined` instead of both that and `null` to denote 
> omitted values for optional arguments in ES6? Before this change, it 
> was a frequent idiom to check optional arguments via `== null` instead 
> of `=== undefined` and pass `null` as the argument to denote the 
> absence of a value.
> Just a curious question.
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