Best Time to Buy and Sell Stock LeetCode solution in JavaScript

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var maxProfit = function (prices) {
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  let L = 0;
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  let result = 0;
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  let length = prices.length;
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  for (let R = 1; R < length; R++) {
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    if (prices[L] > prices[R]) {
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      L = R;
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    } else {
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      result = Math.max(result, prices[R] - prices[L]);
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    }
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  }
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  return result;
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};