Map-iterator-remove-1.js

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// A map iterator can cope with removing the current entry.

function test(pairs) {

    print(JSON.stringify(pairs));

    var map = new Map(pairs);

    var all_keys = '';

    var false_keys = '';

    for (let [k, v] of map) {

        all_keys += k;

        if (!v)

            false_keys += k;

    var log = '';

    for (let [k, remove] of map) {

        log += k;

        if (remove)

            map.delete(k);

    assertEq(log, all_keys);

    var remaining_keys = [...map].map(([k]) => k).join('');

    assertEq(remaining_keys, false_keys);

// removing the only entry

test([['a', true]]);

// removing the first entry

test([['a', true], ['b', false], ['c', false]]);

// removing a middle entry

test([['a', false], ['b', true], ['c', false]]);

// removing the last entry

test([['a', false], ['b', false], ['c', true]]);

// removing all entries

test([['a', true], ['b', true], ['c', true]]);