setinterval vs settimeout in javascript\

var intervalID = setInterval(alert, 1000); // Will alert every second.
// clearInterval(intervalID); // Will clear the timer.

setTimeout(alert, 1000); // Will alert once, after a second.
setInterval(function(){ 
	console.log("Oooo Yeaaa!");
}, 2000);//run this thang every 2 seconds// Set the date we're counting down to
var start_at = new Date('2020-06-29 12:00:00');

// Update the count down every 1 second
var x = setInterval(function() {

    // Get todays date and time
    var now = new Date();
    
    // Find the distance between now an the count down date
    var distance = now - start_at;
	
    
    // Time calculations for days, hours, minutes and seconds
    var days = Math.floor(distance / (1000 * 60 * 60 * 24));
    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);
    
    // Output the result in an element with id="demo"
    document.getElementById("demo").value = hours + "h "
    + minutes + "m " + seconds + "s ";
}, 1000);/*The difference between setTimeout() and setInterval() is that
setTimeout() only executes code once, but setInterval() executes
the code each amount of time you input. For example,*/

/*In this function, it executes a function after 1000 milliseconds, or 1
second.*/
function oneSecond(){
  setTimeout(1000, function(){
    console.log('That was 1 second.')
  })
}

/*In this function, it executes a function every 1 second*/
function stopWatch(){
  var count = 0;
  setInterval(1000, function(){
    console.log(count + " Seconds passed")
  })
}var intervalID = setInterval(alert, 1000); // Will alert every second.
// clearInterval(intervalID); // Will clear the timer.

setTimeout(alert, 1000); // Will alert once, after a second.var intervalID = scope.setInterval(func, [delay, arg1, arg2, ...]);
var intervalID = scope.setInterval(function[, delay]);
var intervalID = scope.setInterval(code, [delay]);