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Acquia Developer Center Blog: ES6 for Drupal Developers: Arrow Functions, Concise Methods, and Other Syntactic Features

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Object structures and functions are possibly two of the most commonly utilized syntactic features in JavaScript, as they both have important roles in defining classes in object-oriented programming. In ES6, defining methods and functions has become much easier with the help of concise properties and methods, and especially arrow functions, which may help to limit the lines of code you have to write.

Source: 
https://dev.acquia.com/blog/es6-for-drupal-developers-arrow-functions-concise-methods-and-other-syntactic-features/07/04/2017/17986