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mongo/jstests/core/eval4.js

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t = db.eval4;
t.drop();
t.save({a: 1});
t.save({a: 2});
t.save({a: 3});
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assert.eq(3, t.count(), "A");
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function f(x) {
db.eval4.remove({a: x});
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}
f(2);
assert.eq(2, t.count(), "B");
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db.eval(f, 2);
assert.eq(2, t.count(), "C");
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db.eval(f, 3);
assert.eq(1, t.count(), "D");