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function sum(...nums) { return nums.reduce((a, b) => a + b, 0); } sum(1, 2, 3, 4); // 10 const arr1 = [1, 2]; const arr2 = [3, 4]; const merged = [...arr1, ...arr2]; // [1,2,3,4] const obj = { a: 1 }; const clone = { ...obj, b: 2 }; // { a:1, b:2 } Math.max(...[5, 3, 9]); // 9
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