David-Sarah Hopwood wrote:
> Michael Daumling wrote:
>> Hi all,
>>
>> The following code produces a "first is not a function" error:
>>
>> Array.prototype.first = function()
>> { return this.length == 0 ? null : this[0]; }
>> // no semicolon here
>> (function() { if ([1,2].first() == 1) alert ("OK"); }())
>>
>> If the two statements are separated via a semicolon, there is no error.
>>
>> The problem is that the second statement is treated as a function
>> argument to the function-expression.
>
> This is not a bug.
>
> A semicolon clearly can't be inserted here because it would change the
> meaning of a valid program
I meant to say "of a syntactically valid program".
> -- as opposed to making an invalid program
> valid as in other cases of semicolon insertion. (Nor should we even
> be considering *any* extensions to semicolon insertion, which is and
> always was simply a bad idea.)
>
> The program also can't be made invalid
syntactically invalid
> because that would be a backward-incompatible change, and because there
> is no reason to make it invalid.
--
David-Sarah Hopwood
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