Children position in tween

Phaser 3
1

I have a container, which is used in tween.

this.tween_zone = this.tweens.add({
targets: this.container,
y: gameOptions.GAME_H+this.container.first.displayHeight*this.container.list.length/2,
ease: 'Linear',
duration: 8000,
onComplete: function(){
        				for(var obj of this.targets){
        					obj.destroy();
        				}
        				this.parent.scene.container.destroy();
        				this.parent.scene.drawZone();
        				this.tween_zone = null;
        			}
        		});

I need to know if a child has crossed a particular position.

chrome_2019-07-11_12-34-40
chrome_2019-07-11_12-34-40.png338×583 33.5 KB

In this example, I need to check if rectangle went below the ball. I will be glad to get help!

2

Okay, I try this one, but not sure that it is correct

update: function () {
		this.container.iterate(function (obj) {
			if (obj.constructor.name === 'Rectangle') {
				if (obj.getBounds().y >= this.ball.y+this.ball.displayHeight) {
					this.gameOver();
				}
			}
		}, this);