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// Performance anti-patterns $(".item").css("color", "red"); // OK // Bad: repeated DOM query in loop for (let i = 0; i < 100; i++) { $(".list").append("<li>" + i + "</li>"); } // Better: cache + build string const $list = $(".list"); let html = ""; for (let i = 0; i < 100; i++) { html += `<li>${i}</li>`; } $list.html(html);
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