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https://www.javatpoint.com/javascript-object-getownpropertynames-method
JavaScript Object.getOwnPropertyNames() Method. The Object.getOwnPropertyNames() method returns an array of all properties (except those non-enumerable properties which use symbol) found directly upon a given object. Syntax:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols
Similar to Object.getOwnPropertyNames(), you can get all symbol properties of a given object as an array of symbols. Note that Object.getOwnPropertyNames() itself does not contain the symbol properties of an object and only the string properties.36%
https://stackoverflow.com/questions/8240802/is-it-possible-to-simulated-object-getownpropertynames-in-ie8
Is it possible to simulate Object.getOwnPropertyNames in IE8? I'm trying to get this fiddle to work in IE8. I believe the only thing left is to make a function simulating getOwnPropertyNames. Of course other solutions to the base problem of extending a JavaScript object with …
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
Note that the for...in loop is already only iterating enumerable items, so one should not assume based on the lack of non-enumerable properties shown in the loop that hasOwnProperty itself is confined strictly to enumerable items (as with Object.getOwnPropertyNames()).4%
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
If you want all properties—including non-enumerables—see Object.getOwnPropertyNames(). Notes. In ES5, if the argument to this method is not an object ... To add compatible Object.keys support in older environments that do not natively ... For a simple Browser Polyfill, see Javascript - Object.keys Browser Compatibility. Specifications ...4%
http://kangax.github.io/compat-table/es5/
ECMAScript 5 6 2016+ next intl non-standard compatibility table. ... §Object.getOwnPropertyNames ... ` both yield false - whereas in a compliant browser, the former would give `false`, the latter `true`. As such, ES5 array iteration methods can only be shimmed reliably when dealing with dense arrays.
https://bugzilla.mozilla.org/show_bug.cgi?id=518663
It's time to have the argument about binary compatibility. I see no way to support Object.getOwnPropertyNames on arbitrary objects without adding a new hook to JSClass to do so. Since resolve hooks can add arbitrary properties without the engine having any knowledge of such, anything using existing APIs will miss those properties.
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