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