Out of curiosity, why are classes specified to have a [[Call]] internal method instead of special-casing `typeof` and friends to work with them? Somewhat of a tangent, but just a curious question on the design decision.
On Tue, Jan 17, 2017, 08:31 Claude Pache <[email protected]> wrote: > > > Le 16 janv. 2017 à 18:00, Michael Haufe <[email protected]> a > écrit : > > > > The question came up recently on CLJS [1] on how to determine if an > object is safe to call as a Constructor. > > The two following procedures will determine whether an object is a > constructor without running it, according to ES6. (Whether it is safe to > call it as constructor... you need first a definition of "safe".) > > (1) Using `class/extends`: > > ```js > function isConstructor1(f) { > if (f === null) > return false > try { > class c extends f { } > return true > } > catch (e) { > return false > } > } > ``` > > (2) Using `Proxy`: > > ```js > function isConstructor2(f) { > var p = new Proxy(f, { construct() { return {} } }) > try { > new p > return true > } > catch (e) { > return false > } > } > ``` > > > —Claude > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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