ECMAScript 2020 New Features

ECMAScript 2020, also known as ES11, introduced several new features to JavaScript. Some of the key features introduced in ECMAScript 2020 include:

  1. BigInt:
    • Allows the representation of arbitrarily large integers.
    • Created by appending n to the end of an integer literal or by calling the BigInt() constructor.
    • Example:

                                  const bigNum = 123456789012345678901234567890n;

  2. Dynamic Import:
    • Enables importing modules dynamically using import().
    • Allows loading modules conditionally or on-demand.
    • Example:

                                  const module = await import('./module.js');

  3. Nullish Coalescing Operator (??):
    • Provides a way to handle default values for null or undefined values.
    • Returns the right-hand side operand when the left-hand side operand is null or undefined.
    • Example:

                                  const value = null ?? 'default';

  4. Optional Chaining (?.):
    • Simplifies accessing properties of nested objects when some properties may be null or undefined.
    • Allows chaining of property accesses without having to check for each level's existence.
    • Example:

                                  const address = user?.address?.city;

  5. globalThis:
    • Provides a standard way of accessing the global object across different environments.
    • Offers a unified way to access the global object regardless of the context (e.g., browser, Node.js).
    • Example:


  6. Promise.allSettled():
    • Returns a promise that resolves after all the provided promises have settled (fulfilled or rejected).
    • Provides an array of objects with information about each promise's fulfillment status.
    • Example:

                                  Promise.allSettled([promise1, promise2])
                                  .then(results => console.log(results));                          

These features enhance JavaScript by providing better ways to handle nullish values, manage asynchronous operations, and improve code readability and maintainability.

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