#90 Coding- Find second-highest number in an array in javascript

Find the second-highest number in a JavaScript array:

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✅ Approach 1: Using Sorting (Simple & Easy)

const arr = [10, 5, 8, 12, 7, 12];

const uniqueSorted = [...new Set(arr)].sort((a, b) => b - a);
const secondHighest = uniqueSorted[1];

console.log("Second highest:", secondHighest);

🟢 Output:

Second highest: 10

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✅ Approach 2: Without Sorting (Efficient for Large Arrays)

function findSecondHighest(arr) {
  let max = -Infinity;
  let secondMax = -Infinity;

  for (let num of arr) {
    if (num > max) {
      secondMax = max;
      max = num;
    } else if (num > secondMax && num < max) {
      secondMax = num;
    }
  }

  return secondMax === -Infinity ? null : secondMax;
}

const arr = [3, 9, 1, 9, 4, 7];
console.log("Second highest:", findSecondHighest(arr));

🟢 Output:

Second highest: 7