Passing data to a child component setter in Angular

It is possible to make the data from the parent component go to the setter of a private property. Let's look at an example. Let's say we have a private property with a setter and a getter:

class UserComponent {
	private _name: string = '';
	
	set name(name: string) {
		if (name.length < 3) {
			this._name = name;
		} else {
			console.log('error');
		}
	}
	
	get age() {
		return this._userAge;
	}
}

For example, let's make an age setter, in which we will implement the check of the transferred data. We will also make a getter to display the user properties:

class UserComponent {
	private _name: string = '';
	
	@Input()
	set name(name: string) {
		if (name.length > 3) {
			this._name = name;
		} else {
			console.log('error');
		}
	}
	
	get name() {
		return this._name;
	}
}

Now let's pass data from the parent component to the child:

<user-data name="john"></user-data>

And in the child component we will display the passed name on the screen:

<p>{{ name }}</p>

Explain why the private property _name begins with an underscore.

Implement setters and getters for the product name and price, which will be passed down from the parent component.