Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
const square = a => a * a;

console.log(square(8));


[1,3,4,8,2,6].map(a => a * a);
</script>


<script id="jsbin-source-javascript" type="text/javascript">const square = a => a * a;

console.log(square(8));


[1,3,4,8,2,6].map(a => a * a);</script></body>
</html>