array-iterator-changing.js

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// Array iterators reflect changes to elements of the underlying array.

load(libdir + "asserts.js");

load(libdir + "iteration.js");

var arr = [0, 1, 2];

var it = arr[Symbol.iterator]();

arr[0] = 1000;

arr[2] = 2000;

assertIteratorNext(it, 1000);

assertIteratorNext(it, 1);

assertIteratorNext(it, 2000);

assertIteratorDone(it, undefined);

// test that .keys() and .entries() have the same behaviour

arr = [0, 1, 2];

var ki = arr.keys();

var ei = arr.entries();

arr[0] = 1000;

arr[2] = 2000;

assertIteratorNext(ki, 0);

assertIteratorNext(ei, [0, 1000]);

assertIteratorNext(ki, 1);

assertIteratorNext(ei, [1, 1]);

assertIteratorNext(ki, 2);

assertIteratorNext(ei, [2, 2000]);

assertIteratorDone(ki, undefined);

assertIteratorDone(ei, undefined);