Set-iterator-remove-4.js

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// Multiple live iterators on the same Set can cope with removing entries.

load(libdir + "iteration.js");

// Make a set.

var set = new Set();

var SIZE = 7;

for (var j = 0; j < SIZE; j++)

    set.add(j);

// Make lots of iterators pointing to entry 2 of the set.

var NITERS = 5;

var iters = [];

for (var i = 0; i < NITERS; i++) {

    var iter = set[Symbol.iterator]();

    assertIteratorNext(iter, 0);

    assertIteratorNext(iter, 1);

    iters[i] = iter;

// Remove half of the set entries.

for (var j = 0; j < SIZE; j += 2)

    set.delete(j);

// Make sure all the iterators still work.

for (var i = 0; i < NITERS; i++) {

    var iter = iters[i];

    for (var j = 3; j < SIZE; j += 2)

        assertIteratorNext(iter, j);

    assertIteratorDone(iter, undefined);