This can be achieved with the help of default function parameters. It may be handy to set a different value instead. In JavaScript, the default value for function parameters is undefined. One can write code in ES5 and gradually switch to ES6 features with ease.īelow is the list of top ES6 features every JavaScript developer should know, With Object-Oriented Classes, Arrow Functions, String Literals and much more, ES6 is a feature-rich advancement to ES5, the previous version of JavaScript, and is 100% backwards compatible. Despite being represented differently internally, at the minimum, all Promise-like objects implement the Thenable interface.

With a lot of forward-thinking features (ES6) attached to it, JavaScript is an exciting language to program.ĮS6 is the basis for modern programming languages like Angular and ReactJs. The JavaScript ecosystem had made multiple Promise implementations long before it became part of the language. ES6 has many new features that can help a developer understand and write code more efficiently. ES6 is a new standardized version of javascript that was released in 2015.

Javascript es6