first.js 285 Bytes
"use strict";

exports.__generic = function (t, a) { a(t.call(this), this[0]); };
exports[""] = function (t, a) {
	var x;
	a(t.call([]), undefined, "Empty");
	a(t.call(new Array(234), undefined, "Sparse empty"));
	x = new Array(2342);
	x[434] = {};
	a(t.call(x), x[434], "Sparse");
};