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var base = {foo: 10, bar: 20}; var gen1 = Object.create(base); var gen2 = Object.create(gen1); base.baz = 30; gen1.quux = 50; gen2.kaka = 10; gen1.foo; //: number gen2.foo; //: number gen1.baz; //: number gen2.baz; //: number gen1.quux; //: number gen2.quux; //: number gen1.kaka; //: ? var extend = Object.create(base, {prop1: {value: "hi"}, prop2: {}}); extend.prop1; //: string extend.bar; //: number var empty = Object.create(null); empty.prop1 = "hi"; empty.hasOwnProperty; //: ? empty.prop1; //: string