JSFiddle - React, Tailwind, and code Playground

HTML

<p>Before</p>
<pre id="before"></pre>

<p>After</p>
<pre id="after"></pre>

CSS

pre { display: block; }

JavaScript

var $scope = {}, value1 = 'value1', value2 = 'value2';

$scope.data = { prop1: value1, prop2: value2};
document.getElementById('before').innerHTML = JSON.stringify($scope.data);

$scope.data.newProp = $scope.data.prop1;
delete $scope.data.prop1;

document.getElementById('after').innerHTML = JSON.stringify($scope.data);