test/mjsunit/logical.js

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var undef = void 0;

assertEquals(1, 1 || 0);
assertEquals(2, 0 || 2);
assertEquals('foo', 0 || 'foo');
assertEquals(undef, undef || undef);
assertEquals('foo', 'foo' || 'bar');
assertEquals('bar', undef || 'bar');
assertEquals('bar', undef || 'bar' || 'baz');
assertEquals('baz', undef || undef || 'baz');

assertEquals(0, 1 && 0);
assertEquals(0, 0 && 2);
assertEquals(0, 0 && 'foo');
assertEquals(undef, undef && undef);
assertEquals('bar', 'foo' && 'bar');
assertEquals(undef, undef && 'bar');
assertEquals('baz', 'foo' && 'bar' && 'baz');
assertEquals(undef, 'foo' && undef && 'baz');

assertEquals(0, undef && undef || 0);
assertEquals('bar', undef && 0 || 'bar');