setinterval vs settimeout in javascript 5c

1.setTimeout() //executes the code after x seconds.
2.setInterval() //executes the code **every** x seconds.

1var intervalID = setInterval(alert, 1000); // Will alert every second.
2// clearInterval(intervalID); // Will clear the timer.
3
4setTimeout(alert, 1000); // Will alert once, after a second.
5setInterval(function(){ 
6	console.log("Oooo Yeaaa!");
7}, 2000);//run this thang every 2 seconds

1// Set the date we're counting down to
2var start_at = new Date('2020-06-29 12:00:00');
3
4// Update the count down every 1 second
5var x = setInterval(function() {
6
7    // Get todays date and time
8    var now = new Date();
9    
10    // Find the distance between now an the count down date
11    var distance = now - start_at;
12	
13    
14    // Time calculations for days, hours, minutes and seconds
15    var days = Math.floor(distance / (1000 * 60 * 60 * 24));
16    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
17    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
18    var seconds = Math.floor((distance % (1000 * 60)) / 1000);
19    
20    // Output the result in an element with id="demo"
21    document.getElementById("demo").value = hours + "h "
22    + minutes + "m " + seconds + "s ";
23}, 1000);

1setTimeout() //executes the code after x seconds.
2.setInterval() //executes the code **every** x seconds.

1/*The difference between setTimeout() and setInterval() is that
2setTimeout() only executes code once, but setInterval() executes
3the code each amount of time you input. For example,*/
4
5/*In this function, it executes a function after 1000 milliseconds, or 1
6second.*/
7function oneSecond(){
8  setTimeout(1000, function(){
9    console.log('That was 1 second.')
10  })
11}
12
13/*In this function, it executes a function every 1 second*/
14function stopWatch(){
15  var count = 0;
16  setInterval(1000, function(){
17    console.log(count + " Seconds passed")
18  })
19}

1var intervalID = scope.setInterval(func, [delay, arg1, arg2, ...]);
2var intervalID = scope.setInterval(function[, delay]);
3var intervalID = scope.setInterval(code, [delay]);
4