Check If It Is a Straight Line LeetCode solution in JavaScript

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var checkStraightLine = function (coordinates) {
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  coordinates.sort((a, b) => a[1] - b[1]);
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  let slopeToCheck =
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    (coordinates[1][1] - coordinates[0][1]) /
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    (coordinates[1][0] - coordinates[0][0]);
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  for (let i = 2; i < coordinates.length; i++) {
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    let currSlope =
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      (coordinates[i][1] - coordinates[i - 1][1]) /
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      (coordinates[i][0] - coordinates[i - 1][0]);
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    if (currSlope !== slopeToCheck) return false;
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  }
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  return true;
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};