# ES5 classes

To support legacy browsers without transpiling, Modélico can be used with ES5-style classes. In the case of the `Animal` class from the [introductory example](https://github.com/javiercejudo/modelico/tree/c356c97466264d859bea3d0ad8f9542f3bfd0894/docs/introduction/README.md):

```javascript
(function (M) {
  var m = M.metadata()

  function Animal (fields) {
    M.Base.factory(Animal, fields, this)
  }

  Animal.prototype = Object.create(M.Base.prototype)
  Animal.prototype.constructor = Animal

  Animal.prototype.speak = function () {
    var name = this.name()

    return (name === '')
      ? "I don't have a name"
      : 'My name is ' + name + '!'
  }

  Animal.innerTypes = function () {
    return Object.freeze({
      name: m.string()
    })
  }
}(window.Modelico))
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://modelico.javiercejudo.com/recipes/es5.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.