Hello, I’m young French student, and for my scientific secondary school diploma, I must making a little game. I have choosen so to make a Flappy Bird.
I successfully to make the random pipe, but I would like to generat more than one.
Please could you help me ?
Thank’s
Ps: Sorry for my English but I learn in France ! 
My code
var xt = 800; //coordonnées x du tuyau
var nt =0; //nombre de tuyau qui spawn
var yt; //coordonnées de la hauteur du tuyau
function setup() {
createCanvas(800, 500); //création de canvas
yt = random(50,390); //choix random de la hauteur du tuyau
}
function dessinpipe(yt){
stroke (0); //contour noir
fill(0,220,0); //rmeplir en vert
rect(xt,-2,40,yt); //dessin du haut du pipe (x1,y1,largeur,hauteur)
rect(xt,yt+100,40,2000); //dessin du bas du pipe
stroke (100,255,100); // luminosité pipe du haut
fill (100,255,100);
rect(xt+5,0,5,yt);
stroke (0,180,0);
fill (0,180,0);
rect(xt+33,0,5,yt);
stroke (0,180,0);
fill (0,180,0);
rect(xt+28,0,2,yt);
stroke (100,255,100); // luminosité pipe du bas
fill (100,255,100);
rect(xt+5,yt+100,5,2000);
stroke (0,180,0);
fill (0,180,0);
rect(xt+33,yt+100,5,2000);
stroke (0,180,0);
fill (0,180,0);
rect(xt+28,yt+100,2,2000);
stroke (0); //rectangle du pipe
fill(0,220,0);
rect(xt-5,yt-20,50,20); // bas
rect(xt-5,yt+100,50,20); // haut
}
function draw() {
background(222); //fond gris
// while(nt<5){
// dessinpipe(yt); //appel de la fonction dessin du pipe
if(xt>-1000){
dessinpipe(yt);
xt=xt-3; //déplacement du pipe
}
nt=nt+1;
// else if (xt>=-41){
// xt=800;
// }
//}
}