Complex Number Multiplication LeetCode solution in JavaScript

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var complexNumberMultiply = function (num1, num2) {
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  let [realA, imaginaryA] = num1.split("+");
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  let [realB, imaginaryB] = num2.split("+");
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  imaginaryA = parseInt(imaginaryA);
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  imaginaryB = parseInt(imaginaryB);
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  const real = realA * realB - imaginaryA * imaginaryB;
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  const imaginary = realA * imaginaryB + imaginaryA * realB;
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  return `${real}+${imaginary}i`;
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};