d
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    1.0.1 • Public • Published

    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 Build Status

    $ npm test
    

    Security contact information

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


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    Install

    npm i d

    DownloadsWeekly Downloads

    9,719,918

    Version

    1.0.1

    License

    ISC

    Unpacked Size

    22.8 kB

    Total Files

    13

    Last publish

    Collaborators

    • medikoo