JSFiddle - React, Tailwind, and code Playground

JavaScript

console.clear();

function array(x,y) {

console.dir(x);
console.log(Array.isArray(x));
console.log(!(x instanceof Array));

console.dir(y);
console.log(!Array.isArray(y));
console.log(y instanceof Array);

//    return Array.isArray(x) && !(x instanceof Array) &&
//          !Array.isArray(y) &&  (y instanceof Array);
}

array(

	a=Array.prototype,{__proto__:a}

);