JavaScript 2018

JavaScript is a dynamic programming language that is widely used for creating interactive web pages. It was first introduced in 1995 and has since evolved into a powerful language with a large ecosystem of libraries and frameworks. In this article, we will explore some of the new features and improvements introduced in JavaScript 2018.

Async/Await

One of the most significant additions to JavaScript in recent years is the introduction of async/await. This feature simplifies asynchronous programming by allowing us to write asynchronous code in a synchronous manner. It uses promises under the hood to handle asynchronous operations.

async function fetchData() {
  try {
    const response = await fetch('
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error(error);
  }
}

fetchData();

In the above example, the fetchData function is marked as async. This allows us to use the await keyword inside the function. The await keyword pauses the execution of the function until the promise is resolved or rejected. This makes the code look and behave like synchronous code, even though it is asynchronous.

Object Rest/Spread Properties

JavaScript 2018 introduces the object rest and spread properties, which provide a concise syntax for manipulating object properties.

const person = {
  name: 'John',
  age: 25,
  city: 'New York',
};

const { name, ...rest } = person;
console.log(name);  // Output: John
console.log(rest);  // Output: { age: 25, city: 'New York' }

const updatedPerson = { ...person, age: 26 };
console.log(updatedPerson);  // Output: { name: 'John', age: 26, city: 'New York' }

In the above example, the object rest properties are used to extract the name property from the person object and assign the remaining properties to the rest variable. The spread operator is then used to create a new object, updatedPerson, with the age property updated.

Promises Finally

With JavaScript 2018, promises have gained a new finally method. The finally method allows us to execute code regardless of whether the promise is resolved or rejected.

fetch('
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error))
  .finally(() => console.log('Request completed.'));

In the above example, the finally method is used to log a message indicating that the request has completed, regardless of whether it was successful or not.

Conclusion

JavaScript 2018 introduced several new features and improvements that make asynchronous programming and object manipulation more convenient and expressive. Async/await simplifies asynchronous code by allowing us to write it in a synchronous manner. Object rest/spread properties provide a concise syntax for manipulating object properties. Promises finally allows us to execute code regardless of the promise outcome. These additions make JavaScript a more powerful language for building modern web applications.

In this article, we have only scratched the surface of JavaScript 2018. There are many more features and improvements to explore. If you're interested in learning more, I recommend checking out the official ECMAScript specifications or other resources that dive deeper into JavaScript 2018. Happy coding!