I followed this tutorial (https://www.tutorialspoint.com/compare-two-objects-in-javascript-and-return-a-number-between-0-and-100-representing-the-percentage-of-similarity) to be able to compare two objects in JavaScript and return a number between 0 and 100 representing the percentage of similarity.

However, that only works for exact key-value pairs in both objects. I also need to be able to compare number intervals (like on the third "if" statement below for example). The expected result is 70, but currently I am getting 80 (if you comment all "if" statements after the second one, it will give you 40 as the result, which is Correct).

My problem starts when I write the third "if" statement and continue with the others. Actually, after the 3rd "if" statement, the other "if's" don't make any difference on the final result (I don't know why). Could somebody help to find a suitable solution, please?

const a = {
  especie: 'cachorro',
  idade_min: 1,
  idade_max: 3,
  sexo: 'M',
  peso_min: 5,
  peso_max: 10,
  tamanho: 50,
  porte: 100,
  cor: 'preta',
  raça: 'pitbull',
  castrado: true,
  vacinado: true,
};

const b = {
  especie: 'cachorro',
  idade: 2,
  sexo: 'M',
  peso: 10,
  tamanho: 25,
  porte: 100,
  cor: 'branca',
  raça: 'pitbull',
  castrado: false,
  vacinado: false,
};

const findMatch = (first, second) => {
  const firstLength = Object.keys(first).length;
  const secondLength = Object.keys(second).length;
  const smaller = firstLength < secondLength ? first : second;
  const greater = smaller === first ? second : first;

  const count = Object.keys(smaller).reduce((acc, key) => {
    let counter = acc;

    if (Object.keys(greater).includes(key)) {
      if (greater[key] === smaller[key]) {
        console.log(counter);
        return ++counter;
      };

      if (b.idade <= a.idade_max && b.idade >= a.idade_min) {
        return ++counter;
      };

      if (b.peso <= a.peso_max && b.peso >= a.peso_min) {
        return ++counter;
      };

      if (b.tamanho <= a.tamanho) {
        return ++counter;
      };

      if (b.porte <= a.porte) {
        return ++counter;
      };
    };

    console.log(counter);
    return counter;
  }, 0);

  return (count / Math.min(firstLength, secondLength)) * 100;
};

console.log(findMatch(a, b)); // expected result = 70?