JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdn.wijmo.com/5.20142.15/controls/wijmo.min.js"></script>
<link rel="stylesheet" href="http://cdn.wijmo.com/5.20142.15/styles/wijmo.min.css">
<script src="http://cdn.wijmo.com/5.20142.15/controls/wijmo.grid.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.1/angular.min.js"></script>
<script src="http://cdn.wijmo.com/5.20142.15/interop/angular/wijmo.angular.min.js"></script>
<div ng-app="app" ng-controller="appCtrl">
    <p>Wijmo <b>FlexGrid</b> 
    </p>
    <wj-flex-grid items-source="data" item-formatter="itemFormatter">
        <wj-flex-grid-column header="Country" binding="country"></wj-flex-grid-column>
        <wj-flex-grid-column header="Sales" binding="sales"></wj-flex-grid-column>
        <wj-flex-grid-column header="Expenses" binding="expenses"></wj-flex-grid-column>
        <wj-flex-grid-column header="Profit" data-type="Number"></wj-flex-grid-column>
    </wj-flex-grid>
</div>

JavaScript

// define app, include Wijmo 5 directives
var app = angular.module('app', ['wj']);

// controller
app.controller('appCtrl', function ($scope) {

    // create some random data
    var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
        data = [];
    for (var i = 0; i < countries.length; i++) {
        data.push({
            country: countries[i],
            downloads: Math.round(Math.random() * 20000),
            sales: Math.random() * 10000,
            expenses: Math.random() * 5000
        });
    }

    // expose data as a CollectionView to get events
    $scope.data = new wijmo.collections.CollectionView(data);

    $scope.itemFormatter = function (panel, r, c, cell) {
        if (panel.cellType == wijmo.grid.CellType.Cell) {
            var flex = panel.grid;
            //if its calculated column
            if (c == 3) {
                flex.beginUpdate();
                //get data from other columns for this row i.e. profilt=sales-expenses
                var calculatedData = parseInt(flex.getCellData(r, 1, false)) - parseInt(flex.getCellData(r, 2, false));
                //set the value in the calculated column
                flex.setCellData(r, c, calculatedData, true);
                flex.endUpdate();
            }
        }


    }
});