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const original = { site: "https://matiashernandez.dev", published: new Date(), socials: [{ name: "twitter", url: "https://twitter.com/matiasfha" },{ name: "youtube", url: "https://dub.sh/channel" //Subscribe! }] } const copy1 = Object.assign({}, original) const copy2 = { ...original } // Error, this will update the publishedDate property of the original object copy1.published.setTime(10) // Error, this will add an empty object to the original object copy2.socials.push({})