Polynomial Expression

Answer

Not the answer:

function PolynomialExpansion(str) {
  // multiply to polynomial expressions
  const multiply = (a, b) => {
    const variableA = a.match(/[a-zA-Z]\^/i);
    const [coefficientA, exponentA] = a.split(/[a-zA-Z]\^/i);
    const [coefficientB, exponentB] = b.split(/[a-zA-Z]\^/i);

    let newCoefficient;
    if (coefficientA !== '' && coefficientB !== '') {
      newCoefficient = parseInt(coefficientA) * parseInt(coefficientB);
    } else if (coefficientA !== '') {
      newCoefficient = parseInt(coefficientA);
    } else {
      newCoefficient = parseInt(coefficientB);
    }

    let newExponent;
    if (exponentA !== '' && exponentB !== '') {
      newExponent = parseInt(exponentA) + parseInt(exponentB);
    } else if (exponentA !== '') {
      newExponent = parseInt(exponentA);
    } else {
      newExponent = parseInt(exponentB);
    }

    return `${newCoefficient}${variableA ? variableA[0] : ''}${newExponent}`;
  };

  const matches = str.match(/\(.*?\)/gi);
  if (!matches) {
    return;
  }

  const [a, b] = matches.map(el => el.replace('(', '').replace(')', ''));
  let firstEl = a.split(/[+-]/gi);
  let secondEl = b.split(/[+-]/gi);

  let resArr = [];
  for (let i = 0; i < firstEl.length; i++) {
    for (let j = 0; j < secondEl.length; j++) {
      resArr.push(multiply(firstEl[i], secondEl[j]));
    }
  }

  console.log(resArr);
  // code goes here
  return str;
}

// keep this function call here d
console.log(PolynomialExpansion(readline()));
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