The forgotten developer who saved JavaScript

The video opens by revisiting the nightmare that was 2009 for developers. JavaScript was mockingly called the world's worst programming language — a language designed in haste, lacking a standard library, module system, and class support, riddled with cross-browser compatibility nightmares. Developers faced constant frustration: messy, tangled code and a professional culture that dismissed frontend work as low-status "script kiddie" territory, far from any industrial standard or serious engineering practice.

To fill the gaping holes in native JavaScript, Jeremy Ashkenas built Underscore.js — a utility belt packed with dozens of helper functions. In an era when even basic array methods like map and reduce didn't work reliably in Internet Explorer, Underscore gave developers the conveniences they desperately needed. Though the library has all but vanished today, it dramatically eased the pain of day-to-day development and proved just how much third-party libraries could compensate for a language's shortcomings. Many of its ideas were eventually absorbed into the JavaScript standard itself.

Not content with just a utility library, Jeremy next created CoffeeScript — a language that compiled directly to JavaScript. It introduced classes, arrow functions, string interpolation, and other modern syntax while elegantly sidestepping JS's notorious hoisting and type coercion traps. CoffeeScript was wildly popular at its peak, even becoming the default scripting choice in the Rails framework. Though now largely retired, many of the convenient syntax features in modern JavaScript are, in essence, a direct inheritance of and homage to CoffeeScript's design philosophy.

Finally, Jeremy introduced Backbone.js — one of the earliest attempts to bring MVC architecture to the frontend. By abstracting applications into models, collections, and views, it gave developers a way to manage large, complex frontend apps without drowning in tangled DOM manipulation. Backbone powered many prominent early startups, including Trello and Airbnb. While it was ultimately superseded by more advanced frameworks like Angular and React, it proved that building sophisticated client-side applications was entirely possible and set an industry benchmark for frontend architectural thinking.

The video closes by reflecting on Jeremy Ashkenas's contributions and the tech community's tendency to forget its own history. Even though Jeremy's creations have been replaced in the cycle of iteration, the engineering mindset he championed — and his relentless focus on developer experience — form the underlying logic of modern web development. By revisiting these "outdated" technologies, developers can better understand where today's frameworks actually come from and appreciate that every modern advancement stands on the shoulders of the pioneers who did the hard work first.