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Max stock profit algorithm

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	`1`	`+function maxStockProfit(pricesArr) {`
	`2`	`+ let maxProfit = -1;`
	`3`	`+ let buyPrice = 0;`
	`4`	`+ let sellPrice = 0;`
	`5`	`+`
	`6`	`+ let changeBuyPrice = true;`
	`7`	`+`
	`8`	`+ for (let i = 0; i < pricesArr.length; i++) {`
	`9`	`+ if (changeBuyPrice) buyPrice = pricesArr[i];`
	`10`	`+ sellPrice = pricesArr[i + 1];`
	`11`	`+`
	`12`	`+ if (sellPrice < buyPrice) {`
	`13`	`+ changeBuyPrice = true;`
	`14`	`+ } else {`
	`15`	`+ let tempProfit = sellPrice - buyPrice;`
	`16`	`+ if (tempProfit > maxProfit) maxProfit = tempProfit;`
	`17`	`+ changeBuyPrice = false;`
	`18`	`+ }`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ return maxProfit;`
	`22`	`+}`
	`23`	`+`
	`24`	`+maxStockProfit([10, 18, 4, 5, 9, 6, 16, 12]); // 12`

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