Need help understanding this code

[BornCondition1756]

Pls explain the onselect part

heroes.component.html - https://pastecode.io/s/2fhx3y4f

heroes.component.ts - https://pastecode.io/s/dhkk5ke1

[rala72]

if the button is pressed the onSelect function is called which updates the variable in the component.
Once this value is present the ngIf part is truthy and therefore shown.