exponentialBackoff.js

function exponentialBackoff(url, retries, delay, callback) {
    const success = ping(url); 
    if (success) {
        callback(result); // successfull ping
    } else {
        if (retries > 0) {
            setTimeOut(function() {
                exponentialBackoff(url, --retries, delay * 2, callback);
            }, delay);
        } else {
            console.log("Tried connecting", retries, "number of times, but failed.");
        }
    }
}