Thanks for letting us know. Can you share the code you used? It will be helpful for improving the experience.
Meanwhile, you can move forward with this code:
function greet(name="NULL")
{
if(name!="NULL")
{
console.log("Hello "+name+"! Thanks for joining us.");
}
else {
console.log("What is your name?");
}
}
// call the function
greet("dd");
