4-11 Hacker Rank

4-11 Hacker Rank

Imagine you're a stock trader. You'd like to compare how you actually did trading a stock yesterday with how well you could have done. To do this, you'll need to find the maximum profit you could have made by buying once and selling once yesterday.
 
Given an array of stock prices representing the price of the stock each minute, write a function that returns the best profit you could have made making 1 purchase and 1 sale of that stock.
 
For example:
 
var stockPrices = [9, 6, 7, 5, 10, 8];

findMaxProfit(stockPrices)
// returns 5 (buying at $5 and selling for $10)
Caveats:
1) You must buy before you sell.
2) You may not buy and sell at the same time (at least 1 minute must pass).
 
 function findMaxProfit(stockPrices) {


}