setBanner.js

const exampleImages = [ 
    'example_0.jpg',
    'example_1.jpg',
    'example_2.jpg'
]

let currentIndex = -1;

/**
 * @function setBanner
 * @description sets discord guild banner every minute
 * 
 * @param {<Discord<Client>} client discord client
 * @param {String} guildID discord guild id
 * @param {Array<String>} images images to be displayed
 */
const setBanner = (client, guildID, images) => {
    currentIndex += 1;
    
    if (currentIndex >= images.length) {
        currentIndex = 0;
    };

    client.guilds.find(guild => guild.id === guildID).setBanner(images[currentIndex]);
};

setInterval(setBanner, 60000, client, guildID, images);

    // example
    /** 
     * setInterval(setBanner, 60000, soa, '388542852096983040', exampleImages)
    */