With Spread Operator, allow the expression to expand to multiple arguments, elements, variables, etc.
Example
You can try to run the following code to learn how to work with spread operator −
<html>
<body>
<script>
var a, b, c,d, e, f, g;
a = [10,20];
b = "rank";
c = [30,"points"];
d = "run"
// concat method.
e = a.concat(b, c, d);
// spread operator
f = [...a,b, ...c, d];
document.write(e);
document.write("<br>"+f);
</script>
</body>
</html>