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My own JavaScript class base
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SmartClass is a module for easily creating and extending classes:

  • create a new class with var NewClass = require("smartclass").extendWith("NewClass",EventEmitter)
  • create a child of an existing smart class with var ExtendedClass = NewClass.extendWith("ExtendedClass",{...})
  • extendWith accepts a name, then any number of extensions. Extensions can be existing JavaScript 'classes', like EventEmitter, and objects defining properties, methods, and meta-properties
  • the name of the class can be accessed on the class itself and any instance of the class through the 'classname' property
  • init: extending objects can contain an init function which is called with the creation arguments, i.e var instance = new NewClass(123) would result in init(123) being called. The same set of arguments will be passed to every init method defined for the class and it's ancestors in the order of extension. That means the first class to extend SmartClass will have it's init methods called, then any class that extends it. Similarly all the binding and resolution functionality described below will be applied before init is called.
  • unenumerable: an array of names of properties and methods that should not be included in for ... in .. constructions, JSON representations, or simple console dumps
  • bind: an array of names of methods that should be bound to the class instance, so that they are always executed in the context of that instance
  • promisifyresult: an array of names of methods that are to be updated to automatically resolve promise arguments and return a promise result. Note that SmartClass will recurse into the arguments entirely and resolve both promises nested in objects and arrays, and promises returned by previously resolved promises. If you need to handle promise arguments more precisely, then you should do it yourself and not use this functionality.
  • promisifycallback: the same as promisifyresult, but instead of resolving the returned promise with the return value of the function, resolves it with a callback. The callback is always passed as the last argument and itself always takes arguments in the form fn(error,arg1,arg2,...,argN)
  • getters / setters can be added to a class with a special "value" - an object containing get and set function properties.
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