Esel is a JavaScript/ECMAScript expression language. It is a small language that can be embedded within a larger JavaScript application and used to evaluate expressions against various datasets, or as a simple but powerful text templating engine. It is roughly equivalent in power to SQL, but is used to query JSON and JavaScript objects rather than databases. Its syntax is similar to that of the Unified Expression Language for Java. It provides list comprehensions, arithmetic expressions, property accesses, functions exported from the hosting application, and other useful features.
