How to sort an array order by Day, and how to access Day in ionic 4

Ionic Framework Ionic Angular
1

this.httpClient.get(‘https://www.

Screenshot (65)
Screenshot (65)1920×1080 292 KB
get_facultyclasstimeframetimetable_data.php?Database=’+Db + ‘&CourseId=’ + this.CourseId + ‘&SectionId=’ + this.SectionId +’&AcademicYear=’ + this.PostData[0].AcademicYear + ‘&FacReserved=’ + this.FacReserved)

  .subscribe

  ((data3) =>{

    this.PostData3 = data3;

    for(let row=1; row<=this.PostData3[0].Day; row++)

    {

      this.Daynum = row;

    

      this.httpClient.get('https://www.get_facultyclasstimeframetimetabledetails_data.php?Database='+Db + '&CourseId=' + this.CourseId + '&SectionId=' + this.SectionId +'&AcademicYear=' + this.PostData[0].AcademicYear + '&FacReserved=' + this.FacReserved + '&DayNum=' + this.Daynum)

      .subscribe

      ((data4) =>{

        this.PostData4 = data4;

        this.dataArr.push(this.PostData4);

      }); 

    }

    

    this.dataArr.sort(function(a, b) {

      return a.Day - b.Day

    });

    //this.dataArr.sort((a,b) => a.Array(8).Day.localeCompare(b.Array(8).Day));

    console.log(this.dataArr);

  });