javascript get all object methods

JavaScript Get All Object Methods

JavaScript is a popular programming language used in web development for creating interactive and dynamic websites. One of the key features of JavaScript is its ability to work with objects. Objects are used to organize and store data and functions in a structured manner.

There may be times when you need to get all the methods available in an object. Here are a few ways to do it:

1. Using Object.getOwnPropertyNames()

The Object.getOwnPropertyNames() method returns an array of all properties found directly in a given object. This includes properties that are not enumerable. We can use this method to get all the methods of an object.

const obj = {
  name: "John",
  age: 25,
  getFullName() {
    return this.name;
  },
  getAge() {
    return this.age;
  }
};

const methods = Object.getOwnPropertyNames(obj).filter(function(property) {
  return typeof obj[property] == 'function';
});

console.log(methods); // ["getFullName", "getAge"]

2. Using Object.keys()

The Object.keys() method returns an array of all properties found directly in a given object. However, it only returns enumerable properties. We can use this method to get all the enumerable methods of an object.

const obj = {
  name: "John",
  age: 25,
  getFullName() {
    return this.name;
  },
  getAge() {
    return this.age;
  }
};

const methods = Object.keys(obj).filter(function(property) {
  return typeof obj[property] == 'function';
});

console.log(methods); // ["getFullName", "getAge"]

3. Using a for...in loop

The for...in loop can be used to iterate over all enumerable properties of an object, including its methods. Here's an example:

const obj = {
  name: "John",
  age: 25,
  getFullName() {
    return this.name;
  },
  getAge() {
    return this.age;
  }
};

const methods = [];

for(let property in obj) {
  if(typeof obj[property] == 'function') {
    methods.push(property);
  }
}

console.log(methods); // ["getFullName", "getAge"]

These are three of the ways to get all the object methods in JavaScript. Choose the one that fits your requirements and use it accordingly.