Sorting Array of Objects.js

import React from 'react';
import Table from './Table';

const Dashboard = React.createClass({
    // Function where the magic happens :D
    sort_by: function(field, reverse, primer) {
        var key = primer ? function(x) {return primer(x[field])} : 
            function(x) {return x[field]};

        reverse = !reverse ? 1 : -1;

        return function (a, b) {
            return a = key(a), b = key(b), reverse * ((a > b) - (b > a));
        };
    },    
    render: function() {
        const { stats } = this.props;

        // Sorting by timestamp and reversing order
        stats.sort(this.sort_by('timestamp', true));

        return (
            <div className="dashboard">
                <h1>Dashboard</h1>
                <Table stats={stats.slice(0, 10)} />
            </div>
        );
    }
});

export default Dashboard;