source: trip-planner-front/node_modules/lodash/defaults.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1var baseRest = require('./_baseRest'),
2 eq = require('./eq'),
3 isIterateeCall = require('./_isIterateeCall'),
4 keysIn = require('./keysIn');
5
6/** Used for built-in method references. */
7var objectProto = Object.prototype;
8
9/** Used to check objects for own properties. */
10var hasOwnProperty = objectProto.hasOwnProperty;
11
12/**
13 * Assigns own and inherited enumerable string keyed properties of source
14 * objects to the destination object for all destination properties that
15 * resolve to `undefined`. Source objects are applied from left to right.
16 * Once a property is set, additional values of the same property are ignored.
17 *
18 * **Note:** This method mutates `object`.
19 *
20 * @static
21 * @since 0.1.0
22 * @memberOf _
23 * @category Object
24 * @param {Object} object The destination object.
25 * @param {...Object} [sources] The source objects.
26 * @returns {Object} Returns `object`.
27 * @see _.defaultsDeep
28 * @example
29 *
30 * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
31 * // => { 'a': 1, 'b': 2 }
32 */
33var defaults = baseRest(function(object, sources) {
34 object = Object(object);
35
36 var index = -1;
37 var length = sources.length;
38 var guard = length > 2 ? sources[2] : undefined;
39
40 if (guard && isIterateeCall(sources[0], sources[1], guard)) {
41 length = 1;
42 }
43
44 while (++index < length) {
45 var source = sources[index];
46 var props = keysIn(source);
47 var propsIndex = -1;
48 var propsLength = props.length;
49
50 while (++propsIndex < propsLength) {
51 var key = props[propsIndex];
52 var value = object[key];
53
54 if (value === undefined ||
55 (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
56 object[key] = source[key];
57 }
58 }
59 }
60
61 return object;
62});
63
64module.exports = defaults;
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