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The entries() method of the JavaScript Object object is a powerful tool introduced in ES2017. It allows you to retrieve all the own properties of an object and returns them as an array of [key, value] pairs. Usage To understand how to use the entries() method, let’s consider a simple example. Suppose we have an object called person with the properties name and age: const person = { name: 'Fred', age: 87 } We can use the entries() method on the person object to retrieve an array containing all its properties:...

In JavaScript, the getOwnPropertyNames() method of the Object object is used to retrieve a list of all the names of the own properties of a given object. This method returns an array that includes both enumerable and non-enumerable properties. However, it does not consider inherited properties. It’s important to note that non-enumerable properties are not iterated upon. In other words, they are not listed in loops like for..of, rendering them inaccessible through regular enumeration methods....

In JavaScript, the getOwnPropertySymbols() method of the Object object allows you to obtain an array of symbols defined on an object. Symbols are a feature introduced in ES2015, and this method was also added in ES2015. Here is an example of how to use the getOwnPropertySymbols() method: const dog = {} const r = Symbol('Roger') const s = Symbol('Syd') dog[r] = { name: 'Roger', age: 6 } dog[s] = { name: 'Syd', age: 5 } Object....

The is() method is a useful feature introduced in ES2015 that allows you to compare values in JavaScript. This method helps in determining if two values are the same or not. Here is how you can use it: Object.is(a, b) By default, the is() method will return false unless the following conditions are met: Both a and b are the exact same object. Both a and b are equal strings (strings are considered equal if they are composed of the same characters in the same order)....

The isFrozen() method in JavaScript can be used to determine whether an object is frozen or not. When an object is frozen, it means that it cannot be modified. This method accepts an object as an argument and returns true if the object is frozen, and false otherwise. Objects are typically frozen using the Object.freeze() function. When an object is frozen, its properties cannot be added, modified, or removed. The isFrozen() method allows you to check the frozen state of an object and make decisions based on that information....

The isPrototypeOf() method in JavaScript is a powerful tool for determining if an object is in the prototype chain of another object. By calling this method on an object instance and passing in another object as an argument, you can quickly check if the object being called on is a prototype of the argument object. The method returns true if the object is found in the prototype chain, and false if it is not....

Learn everything you need to know about the JavaScript keys() method of the Object object. The Object.keys() method takes an object as an argument and returns an array of all its (own) enumerable properties. const car = { color: 'Blue', brand: 'Ford', model: 'Fiesta' } Object.keys(car) //[ 'color', 'brand', 'model' ] Here, “enumerable properties” refers to properties whose internal enumerable flag is set to true, which is the default behavior. To dive deeper into this concept, you can refer to the documentation on enumerability and ownership of properties on MDN....

In JavaScript, the valueOf() method is used to retrieve the primitive value of an object. It is called on an object instance and returns the underlying primitive value. Here is an example to demonstrate how the valueOf() method works: const person = { name: 'Fred' }; person.valueOf(); // { name: 'Fred' } In the above example, the valueOf() method is called on the person object. As a result, the original object is returned....

In JavaScript, the freeze() method of the Object object plays a vital role. This method takes an object as an argument and returns the same object with a significant change. The object passed as an argument becomes immutable - meaning that no properties can be added, removed, or modified. Let’s take a look at an example: const dog = {} dog.breed = 'Siberian Husky' const myDog = Object.freeze(dog) Object.isFrozen(dog) // true Object....

Learning React may seem like a daunting task, but with the right resources and a consistent approach, you can become a React master. In this blog post, we will guide you through the optimal path to go from zero to proficient in React. Before diving into React, it’s essential to have a solid understanding of JavaScript. If you are just starting out, take the time to explore the fundamentals of JavaScript....