JSFiddle - React, Tailwind, and code Playground

JavaScript

var obj = {
    "dataset": {
        "Categories": [{
            "Desserts": ["Sweets", "Ice Creams", "Pastry"]
        }, {
            "Juices and Beverages": ["Cold", "Hot", "Fresh", "Sodas"]
        }]
    }
}


var x = 'Desserts';
var val = obj.dataset.Categories[0][x];
console.log(val);