is._d.getDay();return null!=e?(a=e,t=this.localeData(),e="string"!=typeof a?a:isNaN(a)?"number"==typeof(a=t.weekdaysParse(a))?a:null:parseInt(a,10),this.add(e-s,"d")):s},it.weekday=function(e){if(!this.isValid())return null!=e?this:NaN;var a=(this.day()+7-this.localeData()._week.dow)%7;return null==e?a:this.add(e-a,"d")},it.isoWeekday=function(e){if(!this.isValid())return null!=e?this:NaN;if(null!=e){var a=(t=e,s=this.localeData(),"string"==typeof t?s.weekdaysParse(t)%7||7:isNaN(t)?null:t);return...