delegates2

Node method and accessor delegation utilty.

Installation

$ npm install delegates2

Example

var delegator = require('delegates2');
 
...
delegator
  .delegate(proto, 'request')
  .method('acceptsLanguages', 'languages')
  .method('is')
  .access('url')
  .access('querystring', 'qs')
  .getter('ip')

API

new Delegate(proto, prop)

Creates a delegator instance used to configure using the prop on the given proto object. (which is usually a prototype).

prop support multi level string and object.

const obj = {
  request: {
    url: {
      query: function(){
        return this === obj.request.url;
      }
    }
  }
};
const source = {
  response: {
    header: {
      type: function(){
        return this === source.response.header;
      }
    }
  }
};
 
delegator
  .delegate(obj, 'request.url')
 
delegator
  .delegate(obj, source.response)
 

Delegate.delegate(proto, target)

Delegates getters, setters, values, and methods from target to proto.

Delegate.auto(proto, target)

Delegates all getters, setters, values, and methods from target to proto.

Delegate#method(name[, targetName])

Allows the given method name to be accessed on the host.
You can set the targetName, specitying then method name, default name.

delegator
  .delegate(obj, 'request.url')
  .method('query', 'qs');
 
obj.qs() // true

Delegate#getter(name[, targetName])

Creates a "getter" for the property with the given name on the delegated object.

Delegate#setter(name[, targetName])

Creates a "setter" for the property with the given name on the delegated object.

Delegate#access(name[, targetName])

Creates an "accessor" (ie: both getter and setter) for the property with the given name on the delegated object.

Delegate#fluent(name[, targetName])

A unique type of "accessor" that works for a "fluent" API. When called as a getter, the method returns the expected value. However, if the method is called with a value, it will return itself so it can be chained. For example:

delegate(proto, 'request.url')
  .fluent('query')
 
// getter
var q = request.query();
 
// setter (chainable)
request
  .query({ a: 1 })
  .query({ b: 2 });

License

MIT