I&#x27;m not quite sure what you are  trying to say with this statement, &quot;I don&#x27;t think I have to mention Python 3 or ECMAScript 6&quot;.<p>ECMAScript 6 is finalized and many people are running it today in production environments either using Node on the backend or on the front-end using a build process that integrates with something like Babel.<p>The following quote implies that you believe JavaScript is runtime evaluated, when in fact the standards body does not specify runtime evaluation or compilation.  That is a decision left up to the implementation.  All major browsers today and Node.js use just in time compilation for JavaScript rather than runtime evaluation.<p>&quot;The compilation cost for a dynamic language like Javascript is zero, the cost being completely amortized with everything happening directly at runtime.&quot;<p>[EDIT]<p>I have added a link to the JavaScript entry on Wikipedia where you can verify that modern browsers compile rather than interprest JavaScript.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;JavaScript" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;JavaScript</a>