make everything one function

js/particles.js

@@ -1,3 +1,4 @@
+function particles() {
     /* create particles animation
         based on the amazing tutorial by 'Franks Labratory'
         https://youtu.be/d620nV6bp0A
@@ -55,7 +56,7 @@ class Particle{
             if (this.y > canvas.height || this.y < 0){
                 this.directionY = -this.directionY;
             }
-
+            /*
             // collision detection between mouse and particles
             let dx = mousePosition.x - this.x;
             let dy = mousePosition.y - this.y;
@@ -74,7 +75,7 @@ class Particle{
                     this.y -= 10;
                 }
             }
-
+            */
             // move particle
             this.x += this.directionX;
             this.y += this.directionY;
@@ -157,3 +158,4 @@ window.addEventListener('mouseout', function(){
 
     init();
     animate();
+}