How to remove a property from an object?

Question

Currently an event is set on checkboxes, and event.target gives me the status (checked = true/false) of checkbox which is clicked.

Answer 1

What you have is an object and not an array (although an array is an object). You declare an object literal with {} whereas an array literal is declared with [].

You can use delete to remove an object property like so

delete selectedMap[event.target.id];