michael@0: // Removing a Map entry already visited by an iterator does not cause any
michael@0: // entries to be skipped.
michael@0: 
michael@0: var map = Map();
michael@0: for (var i = 0; i < 20; i++)
michael@0:     map.set(String.fromCharCode('A'.charCodeAt(0) + i), i);
michael@0: 
michael@0: var log = '';
michael@0: for (var [k, v] of map) {
michael@0:     log += k;
michael@0:     if (v % 5 === 4) {
michael@0:         // Delete all entries preceding this one.
michael@0:         for (let [k1, v1] of map) {
michael@0:             if (k1 === k)
michael@0:                 break;
michael@0:             map.delete(k1);
michael@0:         }
michael@0:     }
michael@0: }
michael@0: assertEq(log, 'ABCDEFGHIJKLMNOPQRST');
michael@0: assertEq(map.size, 1);  // Only the last entry remains.
michael@0: assertEq(map.get('T'), 19);