Map-iterator-add-remove.js

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// Removing and re-adding entries while an iterator is live causes the iterator to visit them again.

var map = new Map([['a', 1]]);

var n = 5;

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

    assertEq(k, 'a');

    assertEq(v, 1);

    if (n === 0)

        break;

    map.delete('a');

    map.set('a', 1);

    n--;

assertEq(n, 0);