title: Ionic 4 *ngFor with numeric values
body: <p>I have ion-slide that iterates n times (n can be 0 or up to 100, any integer).</p>
  <p>The variable n is given in typescript as an element of a collection.</p>
  <p>How can I make the * ngFor, iterate from 0 to n, numeric?</p>
  <p>thanks!</p>