JS

sorting kata

const combine = (...comparators) => (x, y) => comparators.reduce((prev, next) => prev || next(x, y), 0);

const comparators = {
  topCalculatedTariff: (x, y) => topCalculatedTariffService.isTopCalculatedTariff(y) - topCalculatedTariffService.isTopCalculatedTariff(x),
  premiumAsc: (x, y) => x.monthlyPremiumGrossInEur - y.monthlyPremiumGrossInEur,
  premiumDesc: (x, y) => y.monthlyPremiumGrossInEur - x.monthlyPremiumGrossInEur,
  gradeAsc: (x, y) => x.grade - y.grade,
  gradeDesc: (x, y) => y.grade - x.grade
};

const sortByOptions = [
  { label: 'günstigster Preis', value: 'premium-ascending', comparator: combine(comparators.topCalculatedTariff, comparators.premiumAsc, comparators.gradeAsc) },
  { label: 'teuerster Preis', value: 'premium-descending', comparator: combine(comparators.topCalculatedTariff, comparators.premiumDesc, comparators.gradeAsc) },
  { label: 'beste Note', value: 'grade-ascending', comparator: combine(comparators.topCalculatedTariff, comparators.gradeAsc, comparators.premiumAsc) },
  { label: 'schlechteste Note', value: 'grade-descending', comparator: combine(comparators.topCalculatedTariff, comparators.gradeDesc, comparators.premiumAsc) }
];