Count Collisions on a Road LeetCode solution in JavaScript

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/**
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 * @param {string} directions
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 * @return {number}
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 */
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var countCollisions = function (directions) {
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  if (directions.length == 1) {
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    return 0;
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  }
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  let count = 0;
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  let couplet;
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  let retreivedWieght;
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  let convertedArr = [];
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  let rightMovingCount = 0;
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  let weights = new Map();
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  weights.set("LR", 0);
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  weights.set("RL", 2);
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  weights.set("LS", 0);
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  weights.set("SL", 1);
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  weights.set("SR", 0);
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  weights.set("RS", 1);
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  weights.set("LL", 0);
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  weights.set("RR", 0);
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  weights.set("SS", 0);
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  for (let i = 0; i < directions.length; i++) {
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    convertedArr[i] = directions[i];
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  }
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  for (let i = 1; i < convertedArr.length; i++) {
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    couplet = convertedArr[i - 1] + convertedArr[i];
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    retreivedWieght = weights.get(couplet);
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    count = count + retreivedWieght;
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    if (retreivedWieght > 0) {
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      convertedArr[i - 1] = "S";
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      convertedArr[i] = "S";
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      if (rightMovingCount > 0) {
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        count = count + rightMovingCount;
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        rightMovingCount = 0;
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      }
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    }
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    if (couplet === "RR") {
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      rightMovingCount++;
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    }
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  }
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  return count;
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};