mongo/jstests/core/update_bit_examples.js

// Basic examples for $bit
var res;
var coll = db.update_bit;
coll.drop();

// $bit and
coll.remove({})
coll.save({_id:1, a:NumberInt(2)});
res = coll.update({}, {$bit: {a: {and: NumberInt(4)}}})
assert.writeOK(res);
assert.eq(coll.findOne().a, 0)

// $bit or
coll.remove({})
coll.save({_id:1, a:NumberInt(2)});
res = coll.update({}, {$bit: {a: {or: NumberInt(4)}}})
assert.writeOK(res);
assert.eq(coll.findOne().a, 6)

// $bit xor
coll.remove({})
coll.save({_id:1, a:NumberInt(0)});
res = coll.update({}, {$bit: {a: {xor: NumberInt(4)}}})
assert.writeOK(res);
assert.eq(coll.findOne().a, 4)

// SERVER-19706 Empty bit operation.
res = coll.update({}, {$bit: {a: {}}});
assert.writeError(res);