/**
* Finds the largest and second-largest elements in an array.
*/
interface TwoLargestResult {
largest: number;
secondLargest: number;
}
/**
*
* @param numbers Input array of numbers.
* @returns An object containing the largest
* and second-largest elements.
* @throws Error if the array contains fewer than two elements.
*/
function findTwoLargest(numbers: number[]): TwoLargestResult {
if (numbers.length < 2) {
throw new Error("Array must contain at least two elements.");
}
let largest: number = Number.NEGATIVE_INFINITY;
let secondLargest: number = 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
};
}
/**
* Program entry point.
*/
function main(): void {
const numbers: number[] = [3, 4, 9, 6, 7, 1, 2, 5];
const result: TwoLargestResult = findTwoLargest(numbers);
console.log("Array:", numbers);
console.log("Largest element:", result.largest);
console.log("Second largest element:", result.secondLargest);
}
main();
/*
run:
Array: [
3, 4, 9, 6,
7, 1, 2, 5
]
Largest element: 9
Second largest element: 7
*/
