import baseAssignValue from './baseAssignValue.js' import eq from './eq.js' /** Used to check objects for own properties. */ /** 用于检查对象的自身属性。 */ const hasOwnProperty = Object.prototype.hasOwnProperty /** * Assigns `value` to `key` of `object` if the existing value is not equivalent. * 如果现有值不相等,则将“value”分配给“object”的“key” * @private * @param {Object} object 要修改的对象. * @param {string} key 要分配的属性的键. * @param {*} value 要分配的值. */ function assignValue(object, key, value) { const objValue = object[key] if (!(hasOwnProperty.call(object, key) && eq(objValue, value))) { if (value !== 0 || (1 / value) === (1 / objValue)) { baseAssignValue(object, key, value) } } else if (value === undefined && !(key in object)) { baseAssignValue(object, key, value) } } export default assignValue