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README.md

1 #define-properties <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
2 
3 [![Build Status][travis-svg]][travis-url]
4 [![dependency status][deps-svg]][deps-url]
5 [![dev dependency status][dev-deps-svg]][dev-deps-url]
6 [![License][license-image]][license-url]
7 [![Downloads][downloads-image]][downloads-url]
8 
9 [![npm badge][npm-badge-png]][package-url]
10 
11 [![browser support][testling-svg]][testling-url]
12 
13 Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.
14 Existing properties are not overridden. Accepts a map of property names to a predicate that, when true, force-overrides.
15 
16 ## Example
17 
18 ```js
19 var define = require('define-properties');
20 var assert = require('assert');
21 
22 var obj = define({ a: 1, b: 2 }, {
23 	a: 10,
24 	b: 20,
25 	c: 30
26 });
27 assert(obj.a === 1);
28 assert(obj.b === 2);
29 assert(obj.c === 30);
30 if (define.supportsDescriptors) {
31 	assert.deepEqual(Object.keys(obj), ['a', 'b']);
32 	assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'c'), {
33 		configurable: true,
34 		enumerable: false,
35 		value: 30,
36 		writable: false
37 	});
38 }
39 ```
40 
41 Then, with predicates:
42 ```js
43 var define = require('define-properties');
44 var assert = require('assert');
45 
46 var obj = define({ a: 1, b: 2, c: 3 }, {
47 	a: 10,
48 	b: 20,
49 	c: 30
50 }, {
51 	a: function () { return false; },
52 	b: function () { return true; }
53 });
54 assert(obj.a === 1);
55 assert(obj.b === 20);
56 assert(obj.c === 3);
57 if (define.supportsDescriptors) {
58 	assert.deepEqual(Object.keys(obj), ['a', 'c']);
59 	assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'b'), {
60 		configurable: true,
61 		enumerable: false,
62 		value: 20,
63 		writable: false
64 	});
65 }
66 ```
67 
68 ## Tests
69 Simply clone the repo, `npm install`, and run `npm test`
70 
71 [package-url]: https://npmjs.org/package/define-properties
72 [npm-version-svg]: http://versionbadg.es/ljharb/define-properties.svg
73 [travis-svg]: https://travis-ci.org/ljharb/define-properties.svg
74 [travis-url]: https://travis-ci.org/ljharb/define-properties
75 [deps-svg]: https://david-dm.org/ljharb/define-properties.svg
76 [deps-url]: https://david-dm.org/ljharb/define-properties
77 [dev-deps-svg]: https://david-dm.org/ljharb/define-properties/dev-status.svg
78 [dev-deps-url]: https://david-dm.org/ljharb/define-properties#info=devDependencies
79 [testling-svg]: https://ci.testling.com/ljharb/define-properties.png
80 [testling-url]: https://ci.testling.com/ljharb/define-properties
81 [npm-badge-png]: https://nodei.co/npm/define-properties.png?downloads=true&stars=true
82 [license-image]: http://img.shields.io/npm/l/define-properties.svg
83 [license-url]: LICENSE
84 [downloads-image]: http://img.shields.io/npm/dm/define-properties.svg
85 [downloads-url]: http://npm-stat.com/charts.html?package=define-properties
86 
87