Not exactly Reflect.ownKeys does not walk up prototype chain so it does not return inherited members Reflect.enumerate seems not return non-enumerable members What I propose is an API that returns both non-enumerable and inherited members
Best regards Gray Zhang 在 2015年6月1日 上午1:15:58, Zhang,Lili(PAPE) ([email protected]) 写到: Not exactly Reflect.ownKeys does not walk up prototype chain so it does not return inherited members Reflect.enumerate seems not return non-enumerable members What I propose is an API that returns both non-enumerable and inherited members UBFT 张立理 Hi int08h ☎ 18621600455 在 2015年6月1日 上午12:44:52, Harband Jordan ([email protected]) 写到: Would `Reflect.ownKeys` or `Reflect.enumerate` help you here? On Sun, May 31, 2015 at 4:42 AM, Gray Zhang <[email protected]> wrote: Since class’s members are non-enumerable by default (which is a good choice) we cannot use for .. in to iterate over all members of an instance, the same problem could exists in a plain object when we use Object.defineProperty API. In real world there are some scenarios where we need to iterate over members, A common example is we need to find all set{SomeThing} methods so we can do an auto dependency injection. Certainly we can write a 3rd-party function to find all members through prototype chain: function getAllMembersKeys(obj) { let keys = []; while (obj) { keys.push(...Object.getOwnPropertyNames(obj)); obj = Object.getPrototypeOf(obj); } return keys; } But it doesn’t look nice and lacks considerations of many things such as Symbol’d keys. Look around other languages with reflection API, most of them would provide a method to iterate over all members / properties / methods of an instance, so why not we provide a set of utility API: Reflect.getAllMembersNames Reflect.getAllMemberDescriptors Reflect.getAllMethodNames Reflect.getAllMethodDescriptors Reflect.getAllPropertyNames Reflect.getAllPropertyDescriptors Best regards Gray Zhang _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
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