JSFiddle - React, Tailwind, and code Playground

JavaScript

var foo = function () {
    for (var k = 0; k < arguments.length; k++) {
        var args = Array.slice(arguments);
        if (Array.isArray(args[k])) {
            args = args.reduce(function (a, b) {
                return a.concat(b);
            });
        }
        console.log(args);
    }
};
foo([3, 4], [5, 4]);