| import eq from './eq.js' | |
| /** Used for built-in method references. */ | |
| const objectProto = Object.prototype | |
| /** Used to check objects for own properties. */ | |
| const hasOwnProperty = objectProto.hasOwnProperty | |
| /** | |
| * Assigns own and inherited enumerable string keyed properties of source | |
| * objects to the destination object for all destination properties that | |
| * resolve to `undefined`. Source objects are applied from left to right. | |
| * Once a property is set, additional values of the same property are ignored. | |
| * | |
| * **Note:** This method mutates `object`. | |
| * | |
| * @since 0.1.0 | |
| * @category Object | |
| * @param {Object} object The destination object. | |
| * @param {...Object} [sources] The source objects. | |
| * @returns {Object} Returns `object`. | |
| * @see defaultsDeep | |
| * @example | |
| * | |
| * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }) | |
| * // => { 'a': 1, 'b': 2 } | |
| */ | |
| function defaults(object, ...sources) { | |
| object = Object(object) | |
| sources.forEach((source) => { | |
| if (source != null) { | |
| source = Object(source) | |
| for (const key in source) { | |
| const value = object[key] | |
| if (value === undefined || | |
| (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) { | |
| object[key] = source[key] | |
| } | |
| } | |
| } | |
| }) | |
| return object | |
| } | |
| export default defaults |
