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In Fluid, a unit is a bundle of data and functions representing a "type" or "class" of object in JavaScript. Units are defined using plain old objects and functions. JavaScript has a very loose, dynamic type system where objects can be modified and augmented freely at run time. The language doesn't have the concept of classes, and many familiar attempts to impose a classical system on the language have proved awkward and unworkable. Units address this by embracing a simple and functional approach to packaging up objects.

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In idiomatic JavaScript, inheritance is prototypal. An object can inherit from another object simply by creating a new instance and modifying its functionality. No classes, no static types. Used carefully, this is a good thing.

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