text: // array.keys() returns an iterator over the index of elements
  // and array.entries() returns an iterator that yields pairs [index, element].
  
  load(libdir + "iteration.js");
  
  var data = [1, 2, 3, "abc"];
  
  var ki = data.keys();
  for (var i = 0; i < data.length; i++)
    assertIteratorResult(ki.next(), i, false);
  assertIteratorDone(ki, undefined);
  
  var ei = data.entries();
  for (var i = 0; i < data.length; i++)
    assertIteratorResult(ei.next(), [i, data[i]], false);
  assertIteratorDone(ei, undefined);
  