Map-delete-size.js

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// map.delete(k) decrements the map size iff an entry was actually removed.

var m = new Map();

m.delete(3);

assertEq(m.size, 0);

m.set({}, 'ok');

m.set(Math, 'ok');

assertEq(m.size, 2);

m.delete({});

assertEq(m.size, 2);

m.delete(Math);

assertEq(m.size, 1);

m.delete(Math);

assertEq(m.size, 1);