I want to trigger an error so I can see if my code works.

Question

My countdown function contains a promise with a response if resolved and another if rejected (promise got an error). I want to trigger an error on catch to see the console message as prescribed. So for the first time in 24 years I want to hit the SysRq key or break key on my keyboard to trigger the catch error message. BUT modern keyboards no longer have SysRq key or a Break key (common back in the MS-DOS era). How can I trigger the catch error? Thanks in advance.
````
function countdown(seconds) {
return new Promise(function(resolve, reject) {
for(let i=seconds; i>=0; i--) {
setTimeout(function(){
if(i>0) console.log(i + '...');
else resolve(console.log("GO!"));
}, (seconds-i)*1000);
}
});
} // the err does not show on screen in repl.it login realproto
countdown(11).then(
function() {
console.log("countdown completed sucessfully");
},
function(err) {
console.log("countdown experienced an error: " + err.message);
}
);

countdown();
````

Answer 1

Hopefully, this is what you're looking for:

https://repl.it/@ErichBuelow/I-want-to-trigger-an-error-so-I-can-see-if-my-code-works#index.js