Set-delete-size.js

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// set.delete(v) decrements set.size iff the set contained v.

var s = new Set();

for (var i = 0; i < 10; i++)

    s.add(i);

for (var i = 10; i > 0; i--) {

    assertEq(s.size, i);

    assertEq(s.delete(i), false);

    assertEq(s.size, i);

    assertEq(s.delete(i - 1), true);

    assertEq(s.size, i - 1);

    assertEq(s.delete(i - 1), false);

    assertEq(s.size, i - 1);