Determining if an object can be constructed

Claude Pache claude.pache at gmail.com
Thu Jan 19 14:16:05 UTC 2017


> Le 19 janv. 2017 à 13:46, Andrea Giammarchi <andrea.giammarchi at gmail.com> a écrit :
> 
> If you are looking for isClass or similar you can also rely on `Function.prototype.toString` decompilation, which is de facto consistent.
> 
> ```js
> const isClass = (fn) =>
>   typeof fn === 'function' &&
>   !isClass.toString.call(fn).indexOf('class ');
> ```
> 
> Of course if you transpile code, including classes, that'd be useless (but then you'll have many other problems anyway)

It is also useless when `Function#toString()` is not correctly implemented, which is currently the case for Firefox, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1216630 <https://bugzilla.mozilla.org/show_bug.cgi?id=1216630>

—Claude
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