List Down All Prototype Properties of an Javascript Object

Question

Is there any other way to look up for the prototype properties of an javascript object. Lets say I have like this.

function proton() {     this.property1 = undefined;     this.property2 = undefined; };  proton.prototype = {      sample1 : function() {         return 'something';     },      sample2 : function() {         return 'something';     }  };  var my_object = new proton();  console.log(Object.keys(my_object)); 

returns ["property1", "property2"]

console.log(Object.getOwnPropertyNames(my_object)); 

returns ["property1", "property2"]

But what i want to print is the prototype properties of the object my_object.

['sample1', 'sample2']

In order for me to see the prototype properties of that object i need to console.log(object) and from developer tools i can look up for the properties of that object.

But since I am using third party libraries like phaser.js, react.js, create.js so i don't know the list of the prototype properties of a created object from this libraries.

Is there any prototype function of Object to list down all the prototpye properties of a javascript object?

Answer 1

Not a prototype method, but you can use Object.getPrototypeOf to traverse the prototype chain and then get the own property names of each of those objects.

function logAllProperties(obj) {      if (obj == null) return; // recursive approach      console.log(Object.getOwnPropertyNames(obj));      logAllProperties(Object.getPrototypeOf(obj)); } logAllProperties(my_object); 

Using this, you can also write a function that returns you an array of all the property names:

function props(obj) {     var p = [];     for (; obj != null; obj = Object.getPrototypeOf(obj)) {         var op = Object.getOwnPropertyNames(obj);         for (var i=0; i<op.length; i++)             if (p.indexOf(op[i]) == -1)                  p.push(op[i]);     }     return p; } console.log(props(my_object)); // ["property1", "property2", "sample1", "sample2", "constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable"