# What are generator functions in JavaScript?

JavascriptWeb DevelopmentFront End Technology

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>
Published on 24-Jan-2018 07:21:27