Refatorando condições

original.js

console.time('test');

const saldosQtd = [
  {
    qtd: 1
  },
  {
    qtd: 10
  }
];

function verify(saldo, number) {
  if (number < -60) {
    return saldo.qtd + 1;
  }
  if (number >= -60 && number < -40) {
    return saldo.qtd + 1;
  }
}

const array = saldosQtd.map(saldo => {
  return verify(saldo, -70);
});

console.timeEnd('test');

refatorado.js

console.time('my test');

const saldosQtd = [
  {
    qtd: 1
  },
  {
    qtd: 10
  }
];

function getResult(type, arr, number) {
  const conditions = {
    less60() {
      return number < -60 ? arr.qtd + 1 : false;
    },
    between60and40() {
      return number >= -60 && number < -40 ? arr.qtd + 1 : false;
    }
  };
  return conditions[type]();
}

// return getResult(number, arr);
// eslint-disable-next-line dot-notation
// const fn = conditions[type] ? conditions[type] : conditions['default'];
// return fn();
// }

const types = ['less60', 'between60and40'];

const array = saldosQtd.map(saldo => {
  let res = false;
  types.map(type => {
    if (res) return;
    res = getResult(type, saldo, -70);
  });
  return res;
});

console.timeEnd('my test');