JavaScript Playground, Sandbox

You can use this page where you write the code and check the result immediately:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions

JavaScript Testing

More than one year old, but this blog is still my heart winner!!

Read more: http://thejsguy.com/2015/01/12/jasmine-vs-mocha-chai-and-sinon.html

Some other useful links:


http://sinonjs.org/

https://facebook.github.io/jest/

https://medium.com/powtoon-engineering/a-complete-guide-to-testing-javascript-in-2017-a217b4cd5a2a

http://blog.testdouble.com/posts/2016-03-13-testdouble-vs-sinon