Countdowns

closure.js

function setCountDown(n) {
  n = n || 5;
  for ( var i = 0; i <= n; i++ ) {
    (function() {
      var j = n - i;
      setTimeout(function() {
        console.log(j);
      }, 1000 * i);
    }());
  }
}

generator.js

function* countdown(num) {
  while (true) {
    yield num--;
  }
}

function setCountDown(n) {
  n = n || 5;
  var cd = countdown(n);
  for(var i = 0; i <= n; i++) {
   setTimeout(function() {
      console.log(cd.next().value);
    }, 1000 * i);
  }
}

recursive.js

function setCountDown(n) {
  n = n || 5;
  (function cd(i) {
    if ( i >= 0 ) {
      setTimeout(function() {
        console.log(i);
        cd(--i);
      }, 1000);
    }
  }(n));
}