Ask HN: What cool development languages/tools changed your career?
For web development: React.<p>I have been developing web applications on and off throughout my now 20 year career - all the way back when Applets were all the rage. Spent time with a host of technologies and approaches: JSP&#x2F;Servlets, JSF, Struts, GWT, Backbone.  React has been hands down the most productive technology I&#x27;ve used in web space.  I&#x27;m so productive using it that I now <i>enjoy</i> doing front-end development again. I&#x27;ve recently moved away from ES6 via Babel to using TypeScript with React and have been even more productive as I&#x27;m now catching more bugs either in the editor or at &#x27;compile&#x27; time.<p>I&#x27;m now looking at Elm.