122 Best Time to Buy and Sell Stock II.js

// Leetcode 122
// Language: Javascript
// Problem: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
// Author: Chihung Yu
/**
 * @param {number[]} prices
 * @return {number}
 */
var maxProfit = function(prices) {
    if(prices === null || prices.length === 0){
        return 0;
    }
    
    var profit = 0;

    for(var i = 1; i < prices.length; i++){
        var diff = prices[i] - prices[i-1];
        if(diff > 0){
            profit += diff;
        }
    }
    
    return profit;
};