An interface for various checks with ability to stringify to the readable format.
npm install --save this-is
var thisIs = require('this-is');
<script type="text/javascript" src="[path to node modules]/this-is/index.js"></script>
var gt5 = thisIs.gt(5);
JSON.stringify(gt5); // {$check: {gt: 5}}
gt5.check(6); // true
gt5.check(4); // false
var btw10and100 = thisIs.btw(10, 100);
JSON.stringify(btw10and100); // {$check: {btw: [10, 100]}}
btw10and100.check(0); // false
btw10and100.check(50); // true
btw10and100.check(150); // false