What is the yield keyword in JavaScript?

The yield keyword is used in JavaScript to pause and resume a generator function. The value of the expression is returned to the generator's caller.

Here are the Examples −

function* displayRank () {
   var selPlayers= [1, 2, 3, 4];
   for (var a = 0; a < selPlayers.length; a++) {
      yield selPlayers[i];
   }
}

After defining a generator function, use it like the following. H
Here displayRank() is the generator function −

var rank = displayRank(); //
// value: 1
alert(rank.next());
// value: 2
alert(rank.next());
// value: 3
alert(rank.next());
// value: 4
alert(rank.next());
// value: undefined
alert(rank.next());