The Greatest Pun in JavaScript

A programmer's riff on puns demonstrates how JavaScript grammar can produce a visual "{{ }}" templating syntax inside tagged template literals by exploiting object-shorthand and interpolation. It begins with classic puns to frame the idea that grammar permits multiple parses, then explains tagged template literals: a tag function receives the literal's raw text pieces and the evaluated ${...} values separately. It connects that to common templating languages (Mustache, Handlebars, Jinja2, etc.) that use {{ }} and shows a prompt`...` tag that accepts placeholders written as ${{ url }} so the code reads like a familiar template while remaining valid JavaScript.

The mechanic is simple and specific: ${ { url } } uses ES object-shorthand to evaluate to { url: url }, which the tag function can inspect and annotate; the tag can thus produce an annotated string for observability or other processing. The technique was formalized in an SDK collaboration with Helicone in 2024 to support prompt analysis. The write-up frames this as a pun - one string with two parses - and points out the broader idea that grammar and parsing matter for both natural and programming languages, even suggesting probabilistic parsing and multidimensional (spatial) interpretations.