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/node_modules/lodash/isEmpty.js

https://bitbucket.org/coleman333/smartsite
JavaScript | 77 lines | 36 code | 5 blank | 36 comment | 16 complexity | 6d816f786a6d69fc8f0248049c2b418d MD5 | raw file
 1var baseKeys = require('./_baseKeys'),
 2    getTag = require('./_getTag'),
 3    isArguments = require('./isArguments'),
 4    isArray = require('./isArray'),
 5    isArrayLike = require('./isArrayLike'),
 6    isBuffer = require('./isBuffer'),
 7    isPrototype = require('./_isPrototype'),
 8    isTypedArray = require('./isTypedArray');
 9
10/** `Object#toString` result references. */
11var mapTag = '[object Map]',
12    setTag = '[object Set]';
13
14/** Used for built-in method references. */
15var objectProto = Object.prototype;
16
17/** Used to check objects for own properties. */
18var hasOwnProperty = objectProto.hasOwnProperty;
19
20/**
21 * Checks if `value` is an empty object, collection, map, or set.
22 *
23 * Objects are considered empty if they have no own enumerable string keyed
24 * properties.
25 *
26 * Array-like values such as `arguments` objects, arrays, buffers, strings, or
27 * jQuery-like collections are considered empty if they have a `length` of `0`.
28 * Similarly, maps and sets are considered empty if they have a `size` of `0`.
29 *
30 * @static
31 * @memberOf _
32 * @since 0.1.0
33 * @category Lang
34 * @param {*} value The value to check.
35 * @returns {boolean} Returns `true` if `value` is empty, else `false`.
36 * @example
37 *
38 * _.isEmpty(null);
39 * // => true
40 *
41 * _.isEmpty(true);
42 * // => true
43 *
44 * _.isEmpty(1);
45 * // => true
46 *
47 * _.isEmpty([1, 2, 3]);
48 * // => false
49 *
50 * _.isEmpty({ 'a': 1 });
51 * // => false
52 */
53function isEmpty(value) {
54  if (value == null) {
55    return true;
56  }
57  if (isArrayLike(value) &&
58      (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
59        isBuffer(value) || isTypedArray(value) || isArguments(value))) {
60    return !value.length;
61  }
62  var tag = getTag(value);
63  if (tag == mapTag || tag == setTag) {
64    return !value.size;
65  }
66  if (isPrototype(value)) {
67    return !baseKeys(value).length;
68  }
69  for (var key in value) {
70    if (hasOwnProperty.call(value, key)) {
71      return false;
72    }
73  }
74  return true;
75}
76
77module.exports = isEmpty;