Changing values in ionic not getting?

Hi,,

in html

<ion-icon [name]="data.isFavourite ? 'starIcon' : 'star-outline'"  (click)="favourite(data)" id="favourite-data.id">

in ts

favourite(data) {
     if (data.isFavourite || data.isFavourite != undefined) {
      if(data.isFavourite==0){
        data.isFavourite=1;
      }
      else{
        data.isFavourite=0;
      }


  }