HTML5 - Beginners - Clearing a list example.html

<!DOCTYPE = html>
<html><body>
<canvas id="myCanvas" width="640" height="480" style="border:1px solid #d3d3d3;">
Use different browser.
</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var enemylist = {};

for(var i=0;i<10;i++){
	makeenemy(i)
}

for(var key in enemylist){
	ctx.fillRect(enemylist[key].x,enemylist[key].y,32,32);;
}

// Here were clear the enemy list
enemylist = {};

function makeenemy(id){
	var enemy = {
		x:Math.random()*c.width,
		y:Math.random()*c.height,
		id:id,
	};
	enemylist[id] = enemy;
}
</script></body></html>