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/node_modules/lodash/isPlainObject.js

https://bitbucket.org/coleman333/smartsite
JavaScript | 62 lines | 22 code | 7 blank | 33 comment | 8 complexity | 07d55d83123a0491da581f496ac63ce4 MD5 | raw file
 1var baseGetTag = require('./_baseGetTag'),
 2    getPrototype = require('./_getPrototype'),
 3    isObjectLike = require('./isObjectLike');
 4
 5/** `Object#toString` result references. */
 6var objectTag = '[object Object]';
 7
 8/** Used for built-in method references. */
 9var funcProto = Function.prototype,
10    objectProto = Object.prototype;
11
12/** Used to resolve the decompiled source of functions. */
13var funcToString = funcProto.toString;
14
15/** Used to check objects for own properties. */
16var hasOwnProperty = objectProto.hasOwnProperty;
17
18/** Used to infer the `Object` constructor. */
19var objectCtorString = funcToString.call(Object);
20
21/**
22 * Checks if `value` is a plain object, that is, an object created by the
23 * `Object` constructor or one with a `[[Prototype]]` of `null`.
24 *
25 * @static
26 * @memberOf _
27 * @since 0.8.0
28 * @category Lang
29 * @param {*} value The value to check.
30 * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
31 * @example
32 *
33 * function Foo() {
34 *   this.a = 1;
35 * }
36 *
37 * _.isPlainObject(new Foo);
38 * // => false
39 *
40 * _.isPlainObject([1, 2, 3]);
41 * // => false
42 *
43 * _.isPlainObject({ 'x': 0, 'y': 0 });
44 * // => true
45 *
46 * _.isPlainObject(Object.create(null));
47 * // => true
48 */
49function isPlainObject(value) {
50  if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
51    return false;
52  }
53  var proto = getPrototype(value);
54  if (proto === null) {
55    return true;
56  }
57  var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
58  return typeof Ctor == 'function' && Ctor instanceof Ctor &&
59    funcToString.call(Ctor) == objectCtorString;
60}
61
62module.exports = isPlainObject;