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What are generator functions in JavaScript?

Generator Functions allows execution of code in between when a function is exited and resumed later. So, generators can be used to manage flow control in a code. Cancel asynchronous operations easily since execution can be paused anytime.

Here’s the syntax; do not forget to add an asterisk after the “function” keyword. You can add an asterisk using any of the following −

function *myFunction() {}
// or
function* myFunction() {}
// or
function*myFunction() {}

Example

Let’s see how to use a generator function

Live Demo

<html>
   <body>
      <script>
         function* display() {
            var num = 1;
            while (num < 5)
            yield num++;
         }
         var myGenerator = display();

         document.write(myGenerator.next().value);
         document.write("<br>"+myGenerator.next().value);
         document.write("<br>"+myGenerator.next().value);
         document.write("<br>"+myGenerator.next().value);
         document.write("<br>"+myGenerator.next().value);
      </script>
   </body>
</html>
Updated on 16-Jun-2020 06:27:28

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