generate-new-dot-in-update-func.js

// If y distance is greater than dot_distance_apart
if (dots_y[dots_y.length - 1] > dot_distance_apart)
{
  // Choose random new color:
  let new_color = dot_color_options[Math.floor(Math.random()*dot_color_options.length)];

  // Choose random new lane:
  let lane_number = Math.floor(Math.random() * (canvas_element.width / player_move_increment + 1));

  // Convert to new x position:
  let new_x_position = lane_number * player_move_increment;

  // Create new dots by pushing the new x, y, and color to the arrays:
  dots_x.push(new_x_position);
  dots_y.push(0); // all dots start with a y position of 0
  dots_color.push(new_color);
}