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    <p>This:</p> <pre><code>alert(Number(String(foo)) * 2); </code></pre> <p>should do it (but <strong>see below</strong>), if your COM object implements <code>toString</code> (or <code>valueOf</code> with the "string" hint) correctly (and apparently it does, if your <code>innerHTML</code> trick works -- because when you assign <code>foo</code> to <code>innerHTML</code>, the same process of converting the COM object to a string occurs as with <code>String(foo)</code>).</p> <p>From Section 15.5.1 of the 5th Edition ECMAScript spec:</p> <blockquote> <p>When String is called as a function rather than as a constructor, it performs a type conversion.</p> </blockquote> <p>And Section 15.7.1</p> <blockquote> <p>When Number is called as a function rather than as a constructor, it performs a type conversion</p> </blockquote> <p>It may be worth trying just <code>Number(foo) * 2</code> to make sure, but I don't think it'll work (it seems like your COM object only handles conversion to String, not Number, which isn't surprising or unreasonable).</p> <hr> <p><strong>Edit</strong> If <code>String(foo)</code> is failing, try:</p> <pre><code>alert(Number("" + foo) * 2); </code></pre> <p>I'm <strong>very</strong> surprised that your <code>innerHTML</code> trick is working but <code>String(foo)</code> is throwing an error. Hopefully <code>"" + foo</code> will trigger the same <em>implicit</em> conversion as your <code>innerHTML</code> trick.</p> <hr> <p><strong>Edit</strong> Okay, this COM object is being very strange indeed. My next two salvos:</p> <pre><code>alert(("" + foo) * 2); </code></pre> <p>That uses all implicit conversions (adding an object to a string converts the object to a string; applying the <code>*</code> operator to a string converts it to a number).</p> <p>Alternately, we can make the string->number conversion explicit but indirect:</p> <pre><code>alert(parseInt("" + foo) * 2); </code></pre>
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    1. POConverting an int64 value to a Number object in JavaScript
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    1. COI tried that, unfortunately, calling "String(foo)" yields a "String expected" error.
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    2. CO@Matt: Try `alert(Number("" + foo) * 2)` instead. (I'm *very* surprised that `String(foo)` doesn't work, but if `innerHTML = foo` works, then `"" + foo` should work.) (Edited my answer to include this.)
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    3. COInteresting, the result of that is, apparently, always 0, so that won't work either. Thanks though.
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