Set-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 set = new Set(['a']);

var n = 5;

for (let v of set) {

    assertEq(v, 'a');

    if (n === 0)

        break;

    set.delete('a');

    set.add('a');

    n--;

assertEq(n, 0);