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Re: How to specify an object that can be mutable or immutable

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 26 Sep 2013 23:13:14 +1200
Message-ID: <CAOp6jLbS-a4jAb82q784jn_FvCoW7AqM_Je2AFXW0-k_MZtgxw@mail.gmail.com>
To: public-script-coord@w3.org
Immutability and read-only are different. An immutable object is one that
is guaranteed to not change. In your case, a DOMRectReadOnly can change ---
if it's actually a DOMRect. You just can't change it through the
DOMRectReadOnly interface.

This would be more clear if we called it DOMRectImmutable; it would be odd
to have DOMRect extend DOMRectImmutable, because a DOMRect isn't immutable.

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Received on Thursday, 26 September 2013 11:13:42 UTC

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