0122_best_time_to_buy_and_sell_stocks.js

/**
 * @link https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
 * @param {Object []} prices
 * @returns {Number}
 */
export default (prices) => {
  let totalProfit = 0;
  const { length } = prices;
  const set = new Set([0, 1]);

  if (set.has(length)) {
    return totalProfit;
  }

  for (let i = 1; i < length; i += 1) {
    if (prices[i - 1] < prices[i]) {
      totalProfit += prices[i] - prices[i - 1];
    }
  }
  return totalProfit;
};