/**
* Finds the largest and second-largest elements in an array.
*
* @param {number[]} numbers - Input array of numbers.
* @returns {{ largest: number, secondLargest: number }}
* @throws {Error} If the array contains fewer than two elements.
*/
function findTwoLargest(numbers) {
if (numbers.length < 2) {
throw new Error("Array must contain at least two elements.");
}
let largest = Number.NEGATIVE_INFINITY;
let secondLargest = Number.NEGATIVE_INFINITY;
for (const value of numbers) {
// Found a new largest value
if (value > largest) {
secondLargest = largest;
largest = value;
}
// Update second largest if needed
else if (value > secondLargest) {
secondLargest = value;
}
}
return {
largest,
secondLargest
};
}
// Input data
const numbers = [3, 4, 9, 6, 7, 1, 2, 5];
// Find the two largest elements
const { largest, secondLargest } = findTwoLargest(numbers);
// Display results
console.log("Array:", numbers);
console.log("Largest element:", largest);
console.log("Second largest element:", secondLargest);
/*
run:
Array: [
3, 4, 9, 6,
7, 1, 2, 5
]
Largest element: 9
Second largest element: 7
*/
