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d

Property descriptor factory

_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 }
`

$3

$ 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

$3

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

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);
`

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

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
``

Tests

$ npm test

Security contact information

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

---

[build-image]: https://github.com/medikoo/d/workflows/Integrate/badge.svg
[build-url]: https://github.com/medikoo/d/actions?query=workflow%3AIntegrate
[cov-image]: https://img.shields.io/codecov/c/github/medikoo/d.svg
[cov-url]: https://codecov.io/gh/medikoo/d
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[npm-url]: https://www.npmjs.com/package/d