ecma-script-array-tests.js

var ArrayProto = Array.prototype
  , ObjProto   = Object.prototype
;
// Array Tests
["forEach", "map", "reduce", "reduceRight", "filter", "every", "some", 
"indexOf", "lastIndexOf"].forEach(function(key){
  var d = document.createElement("div");
  d.textContent =  key + ": " + ArrayProto[key];
  document.body.appendChild(d);
});
var d = document.createElement("div");
d.textContent = "Array.isArray: " + Array.isArray;
document.body.appendChild(d);

var e = document.createElement("div");
e.textContent = "Object.keys: " + Object.keys;
document.body.appendChild(e);