trackByIdindex
trackByIdindex is a directive in Angular that helps optimize the rendering of lists of data. When displaying a large number of items in an Angular template using `*ngFor`, Angular has to perform a significant amount of work to update the DOM. This includes checking which items have changed, which have been added, and which have been removed. By default, `*ngFor` tracks items by their index in the array. This means if an item is removed from the beginning of an array and all other items shift their positions, `*ngFor` will see each item as changed even if their content remains the same.
The `trackByIdindex` directive, when applied to an `*ngFor` loop, tells Angular to track each item by a