sfcode An Online Competing and Development Environment

D

# Property descriptor factory

Originally derived from es5-ext package.

Defining properties with descriptors is very verbose:

var Account = function () {};
Object.defineProperties(Account.prototype, {
deposit: {
value: function () {
/* ... */
},
configurable: true,
enumerable: false,
writable: true
},
withdraw: {
value: function () {
/* ... */
},
configurable: true,
enumerable: false,
writable: true
},
balance: {
get: function () {
/* ... */
},
configurable: true,
enumerable: false
}
});

D cuts that to:

var d = require("d");
var Account = function () {};
Object.defineProperties(Account.prototype, {
deposit: d(function () {
/* ... */
}),
withdraw: d(function () {
/* ... */
}),
balance: d.gs(function () {
/* ... */
})
});

By default, created descriptor follow characteristics of native ES5 properties, and defines values as:

{ configurable: true, enumerable: false, writable: true }

You can overwrite it by preceding value argument with instruction:

d("c", value); // { configurable: true, enumerable: false, writable: false }
d("ce", value); // { configurable: true, enumerable: true, writable: false }
d("e", value); // { configurable: false, enumerable: true, writable: false }
// Same way for get/set:
d.gs("e", value); // { configurable: false, enumerable: true }

## Installation

    $ npm install d

To port it to Browser or any other (non CJS) environment, use your favorite CJS bundler. No favorite yet? Try: Browserify, Webmake or Webpack

## Other utilities

### autoBind(obj, props) _(d/auto-bind)_

Define methods which will be automatically bound to its instances

var d = require('d');
var autoBind = require('d/auto-bind');
var Foo = function () { this._count = 0; };
Object.defineProperties(Foo.prototype, autoBind({
increment: d(function () { ++this._count; });
}));
var foo = new Foo();
// Increment foo counter on each domEl click
domEl.addEventListener('click', foo.increment, false);

### lazy(obj, props) _(d/lazy)_

Define lazy properties, which will be resolved on first access

var d = require("d");
var lazy = require("d/lazy");
var Foo = function () {};
Object.defineProperties(Foo.prototype, lazy({ items: d(function () { return []; }) }));
var foo = new Foo();
foo.items.push(1, 2); // foo.items array created and defined directly on foo

# Tests <a href="https://travis-ci.org/medikoo/d"><img src="https://travis-ci.org/medikoo/d.png" alt="Build Status"/></a>

    $ npm test

# Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

Get professional support for d with a Tidelift subscription
Tidelift helps make open source sustainable for maintainers while giving companies
assurances about security, maintenance, and licensing for their dependencies.