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 key = "key";
const value = "value";
const obj = {};

for(let i=0; i<100; i++) {
  obj[key+i] = value+i;
}

console.log(JSON.stringify(obj));
</script>


<script id="jsbin-source-javascript" type="text/javascript">const key = "key";
const value = "value";
const obj = {};

for(let i=0; i<100; i++) {
  obj[key+i] = value+i;
}

console.log(JSON.stringify(obj));</script></body>
</html>