Originally derived from d package.
Defining properties with descriptors is very verbose:
javascript
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:
```javascript 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:
javascript
{ configurable: true, enumerable: false, writable: true }
You can overwrite it by preceding value argument with instruction:
```javascript 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 } ```
$ 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
Define methods which will be automatically bound to its instances
```javascript 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); ```
Define lazy properties, which will be resolved on first access
```javascript 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 ```
$ npm test
To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.