Map-iterator-remove-4.js

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

load(libdir + "iteration.js");

// Make a map.

var map = new Map();

var SIZE = 7;

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

    map.set(j, j);

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

var NITERS = 5;

var iters = [];

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

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

    assertIteratorNext(iter, [0, 0]);

    assertIteratorNext(iter, [1, 1]);

    iters[i] = iter;

// Remove half of the map entries.

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

    map.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, j]);

    assertIteratorDone(iter, undefined);