console.log(
[
{href: "https://images.unsplash.com/photo-1430651717504-ebb9e3e6795e", id: "13", title: "Заголовок"},
{href: "https://images.unsplash.com/photo-1458400411386-5ae465c4e57e", id: "52", title: "Заголовок 2"},
{href: "https://images.unsplash.com/photo-1460500063983-994d4c27756c", id: "63", title: "Заголовок 3"},
{href: "https://images.unsplash.com/photo-1452473767141-7c6086eacf42", id: "47", title: "Заголовок 4"}
].findIndex(el => el.href === "https://images.unsplash.com/photo-1430651717504-ebb9e3e6795e")
);