When a function calls itself, it is called recursion and the same works for JavaScript too. Let’s see an example in which a function calls itself
Example
Live Demo
<html>
<body>
<script>
function displayFact(value) {
if (value < 0) {
return -1;
}
// 0 factorial is equal to 1
else if (value == 0) {
return 1;
} else {
return (value * displayFact(value - 1));
}
}
var res = displayFact(5);
document.write("5 factorial = "+res);
</script>
</body>
</html>