JSFiddle - React, Tailwind, and code Playground

JavaScript

Array.prototype.slice = function(){return "trololol";};
document.write( Array.prototype.slice);

var a = document.createElement("iframe");
a.src = "about:blank";
document.body.appendChild(a);
var prototype = a.contentWindow.Array.prototype;

var fn = ["toString", "toLocaleString", "join", "pop", "push",
            "concat", "reverse", "shift", "unshift", "slice", "splice",
            "sort", "filter", "forEach", "some", "every", "map",
            "indexOf", "lastIndexOf", "reduce", "reduceRight"];

for (var i = 0; i < fn.length; ++i) {
    var methodName = fn[i];
    var method = prototype[methodName];

    if (method) {
        Array.prototype[methodName] = method;
    }
}
document.body.removeChild(a);
document.write( Array.prototype.slice);