JSFiddle - React, Tailwind, and code Playground

HTML

<div id="highest"></div>

JavaScript

categories = {
    'personal': 4,
    'swag': 3,
    'mingle': 2,
    'attention': 1
};

function highest(o){
    var h = undefined;
    
    for(var key in o){
        var current = o[key];
        
        if(h === undefined || current > h){
            h = current;
        }
    }
    
    return h;
}

$("#highest").text(highest(categories));