On Feb 20, 2014, at 8:16 AM, Allen Wirfs-Brock <[email protected]> wrote:
>
> Nope, it means that the length of the argument list is less than two, hence
> an argument corresponding to 'deleteCount' was not passed.
>
> http://people.mozilla.org/~jorendorff/es6-draft.html#sec-ecmascript-standard-built-in-objects
> (para 4) says: "Unless otherwise specified in the description of a
> particular function, if a built-in function or constructor is given fewer
> arguments than the function is specified to require, the function or
> constructor shall behave exactly as if it had been given sufficient
> additional arguments, each such argument being the undefined value."
Note lack of the words "not" and "present" above,
> So, "is not present" is how handling of missing arguments is "otherwise
> specified".
>
> If the algorithm need to simply test for an explicitly or implicitly passed
> undefined, it would simply say "If argument is undefined, then ..."
>
> I always thought "not present" was sufficiently descriptive, in combination
> with the missing args default to undefined rule, that it didn't need further
> definition.
Why? Those words do not occur in the rule's definition.
/be
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