javascript 如何枚举es6类方法
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How to enumerate es6 class methods
提问by eguneys
How can I enumerate methods of an ES6 class? similar to Object.keys
如何枚举 ES6 类的方法？如同Object.keys
Here's an example:
下面是一个例子：
class Callbacks {
method1() {
}
method2() {
}
}
const callbacks = new Callbacks();
callbacks.enumerateMethods(function(method) {
// method1, method2 etc.
});
回答by Andrey Ermakov
Object.keys()iterates only enumerable properties of the object. And ES6 methods are not. You could use something like getOwnPropertyNames(). Also methods are defined on prototype of your object so you'd need Object.getPrototypeOf()to get them. Working example:
Object.keys()仅迭代对象的可枚举属性。而 ES6 方法则不然。你可以使用类似的东西getOwnPropertyNames()。此外，方法是在对象的原型上定义的，因此您需要Object.getPrototypeOf()获取它们。工作示例：
for (let name of Object.getOwnPropertyNames(Object.getPrototypeOf(callbacks))) {
let method = callbacks[name];
// Supposedly you'd like to skip constructor
if (!(method instanceof Function) || method === Callbacks) continue;
console.log(method, name);
}
Please notice that if you use Symbols as method keys you'd need to use getOwnPropertySymbols()to iterate over them.
请注意，如果您使用 Symbols 作为方法键，则需要使用getOwnPropertySymbols()它们来迭代它们。
回答by Cerbrus
There is no iterator / getter method like Object.keysin ES6 (yet?). you can, however, use for-ofto iterate over the keys:
没有像Object.keysES6那样的迭代器/getter 方法（还有吗？）。但是，您可以使用for-of迭代键：
function getKeys(someObject) {
return (for (key of Object.keys(someObject)) [key, someObject[key]]);
}
for (let [key, value] of getKeys(someObject)) {
// use key / value here
}
