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const nums = [1, 2, 3, 4, 5, 6]; const doubled = nums.map(n => n * 2); const evens = nums.filter(n => n % 2 === 0); const sum = nums.reduce((acc, n) => acc + n, 0); const firstBig = nums.find(n => n > 3); const idx = nums.findIndex(n => n > 3); console.log(doubled); // [2,4,6,8,10,12] console.log(evens); // [2,4,6] console.log(sum); // 21 console.log(firstBig); // 4 console.log(idx); // 3 console.log(nums.some(n => n > 5)); // true console.log(nums.every(n => n > 0)); // true console.log(nums); // [1,2,3,4,5,6] — unchanged
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