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Re: [WebIDL] Sequences and arrays

From: Giovanni Campagna <scampa.giovanni@gmail.com>
Date: Tue, 7 Jul 2009 12:21:58 +0200
Message-ID: <65307430907070321j6f1c539btac93180244c92686@mail.gmail.com>
To: public-webapps@w3.org
Only one comment:
it should be noted that with
interface Example {
sequence<long> numbers;
}

In EcmaScript ex.numbers != ex.numbers, because each access to
"numbers" creates a new Array
This is probably counterintuitive to most users of the interface and
may prevent many uses of sequence<> as attributes (to avoid such
confusion).

Giovanni

2009/7/7 Cameron McCormack <cam@mcc.id.au>:
> Hello WG.
>
> I’ve finally fixed up sequences in Web IDL, and also added an array
> type.  The difference is that:
>
>  * sequences are effectively pass-by-value, represented by a JS Array
>    or a Java array object, and
>
>  * arrays are pass-by-reference, represented by a JS host object that
>    acts similarly to an Array (including having Array.prototype in its
>    prototype chain, but not supporting sparse arrays) or by a Java
>    object that implements an interface defined in the spec that allows
>    access to elements and the array length.
>
> JS Array objects can also be passed to host objects expecting an array,
> but the Array object will be converted into the special host object.
>
>  http://dev.w3.org/2006/webapi/WebIDL/#idl-sequence
>  http://dev.w3.org/2006/webapi/WebIDL/#idl-array
>
>  http://dev.w3.org/2006/webapi/WebIDL/#es-sequence
>  http://dev.w3.org/2006/webapi/WebIDL/#es-array
>
>  http://dev.w3.org/2006/webapi/WebIDL/#java-sequence
>  http://dev.w3.org/2006/webapi/WebIDL/#java-array
>
> Comments welcome.
>
> --
> Cameron McCormack ≝ http://mcc.id.au/
>
>
Received on Tuesday, 7 July 2009 10:22:38 GMT

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