Equal Rational Numbers LeetCode solution in JavaScript

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var isRationalEqual = function (s, t) {
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  return calculate(s) === calculate(t);
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  function calculate(v) {
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    let start = v.split("(")[0] || v;
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    let newer = (v.split("(")[1] && v.split("(")[1].split(")")[0]) || "0";
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    start = start.includes(".") ? start : start + ".";
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    newer = newer.padEnd(100, newer);
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    return parseFloat(start + newer);
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  }
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};