Logical operators don't use valueOf()

Till Schneidereit till at tillschneidereit.net
Sat Sep 7 17:19:01 PDT 2013


On Sun, Sep 8, 2013 at 2:15 AM, Marius Gundersen <gundersen at gmail.com>wrote:

> > That's the way ToBoolean has always been defined
> http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.1.2 . All
> objects are considered to be Boolean true values.
>
> So does this mean I can override toBoolean to change the way ! behaves on
> an object?
>
No, ToBoolean is a spec-internal abstract operation. I.e., it's a
collection of steps to be taken whenever the operation is required by the
specification of some other operation, but it's not available to JS code.
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