calculateSumAndProduct.js

/**
 * Calculate the sum and product of integers in a list
 *
 * Note: the "sum" is every number added together
 * and the "product" is every number multiplied together
 * so for example: [2, 3, 5] would return
 * {
 *   "sum": 10, // 2 + 3 + 5
 *   "product": 30 // 2 * 3 * 5
 * }
 *
 * Time Complexity: O(N) 2 for loops for loops are 0
 * Space Complexity: O(1) 2 variables
 * Optimal Time Complexity: O(N)
 *
 * @param {Array<number>} numbers - Numbers to process
 * @returns {Object} Object containing running total and product
 */
export function calculateSumAndProduct(numbers) {
	// let sum = 0;
	// for (const num of numbers) {
	//   sum += num;
	// }

	// let product = 1;
	// for (const num of numbers) {
	//   product *= num;
	// }

	// product and sum can be combined to one loop
	let sum = 0;
	let product = 1;

	for (const num of numbers) {
		sum += num;
		product *= num;
	}
	return {
		sum: sum,
		product: product,
	};
}