Further reading about ECMAScript

• ES2015: http://es6-features.org
• ES2016: http://2ality.com/2016/01/ecmascript-2016.html
• ES2017: http://2ality.com/2016/02/ecmascript-2017.html
• ES2018: http://2ality.com/2017/02/ecmascript-2018.html
• ES2019: https://2ality.com/2018/02/ecmascript-2019.html
• Tools to check compatibility with ES features from the following links:
  • http://kangax.github.io
  • https://caniuse.com
• Other books written about JavaScript by Dr. Axel Rauschmayer: http://exploringjs.com