JSFiddle - React, Tailwind, and code Playground

JavaScript

window.whatFor = function (obj, funct) {
    for (var v in obj) {
        if (obj.hasOwnProperty(v)) {
            funct(v);
        }
    }
}

    var sam = {
        yo: "yo",
        yoma: "yoma"
    };

    whatFor(sam, alert);