How to make a rotating banner in JS with array

I'm starting in JS and would like to do rotating banner by placing the images inside a vector instead of doing as in the code below:

function slide1(){
   document.getElementById("banner").src = "img/banner9.png";
   setTimeout(slide2,1000);
}

function slide2(){
   document.getElementById("banner").src = "img/banner8.png";
   setTimeout(slide1,1000);
}

It would be unfair of me to ask you to give me the code, so do you have any guidance where I can search?