(early sent) I meant passing through the prototype. The "unmagic" behavior is when you deal with such object thinking accessing its `__proto__` will behave like others. So it's the other way round but again, I know all of this, I was just confused by it and explained indeed with an example code how it is simulating the `Object.defineProperty`
Thanks anyway for clarifications. On Mon, Oct 14, 2013 at 6:43 PM, Andrea Giammarchi < [email protected]> wrote: > we are lucky enough there's no browser without a native JSON object that > uses the D. Crockford polyfill ^_^ > > > On Mon, Oct 14, 2013 at 6:20 PM, Allen Wirfs-Brock > <[email protected]>wrote: > >> On Oct 14, 2013, at 5:54 PM, Andrea Giammarchi wrote: >> >> Allen my confusion is with o4 ... what happens once you re-set/assign its >> `__proto__` there? >> >> Is it just a normal property so new value will be set ? >> Is it a magic inherited thing (it shouldn't) that will change the o4 >> prototype chain ? >> >> >> JSON.parse is just a function that builds up simple (inheriting from >> Object.prototype) objects using [[DefineOwnProperty]] See >> http://people.mozilla.org/~jorendorff/es6-draft.html#sec-24.3.2 step >> 3.a.iv.3.a. So if the JSON object text contains a "__proto__" property >> key, the object that is created with have a "__proto__" own data property. >> If it doesn't then the Annex B2.2.1 Object.prototype__proto__ property is >> inherited. No magic involved. >> >> Allen >> >> >> ... >>> >>> Assuming that Annex B.2.2.1 and B.3.1 are implemented: here are the >>> cases of interest: >>> >>> let o1 = {__proto__: p}; // o1 inherits from p >>> let o2 = {"__proto__": p}; // o2 inherits from p >>> let o3 = {["__proto__"]: p};// o3 inherits from Object.prototype, has >>> own data property "__proto__" whose value is p. >>> let o4 = JSON.parse('{"__proto__": "value"}'); >>> //o4 inherits from Object.prototype, has own data property >>> "__proto__" whose value is "value" >>> >>> //assuming that Object.prototype.__proto__ has not been tamper with: >>> let o5 = new Object; >>> o5.__proto__ = p ; //o5 inherits from p >>> >>> let o6 =new Object; >>> o6["__proto__"] = p; //o6 inherits from p >>> >>> Allen >>> >> >> >> >
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