Get Id of object in group

[smdu57]

Hello

I'm using an overlap between player (joueur) and bottles (bouteilles). bottles is a group of 4 bottle and I want to know which bottle I'm interacting with in the function called by the overlap 

game.physics.arcade.overlap(joueur,bouteilles,interragitb,null,this);

then the function 

function interragitb(joueur,bouteille){
	cursors = game.input.keyboard.createCursorKeys();
	if (cursors.up.isDown && points > 0)
    {
    	bouteille.frame = bouteille.frame +1;
    	point(0);
    }
}

and I want to increment a variable to know how many times I interracted with a spécific bottle how should I do ? Is there any way to get index in the group or var name ?

 

Thank you

[smdu57]

I found, I just had to set object name on creation then with a switch case I can do what I want