I've relied on the order of keys for URL routing in JavaScript / TypeScript. Each route of the web application is unique, and the order matters - it's surprisin

I've relied on the order of keys for URL routing in JavaScript / TypeScript. Each route of the web application is unique, and the order matters - it's surprisingly easy to end up with otherwise ambiguous routes like /products/:ean and /products/all in real world applications. One benefit of using an object and not just an array is that I can validate at compile time with TypeScript that each route has exactly one handler. An insertion-ordered hashmap works really well for this without requiring any extra syntax or data beyond object literals.