Andishmand/src/utils/filter.js

const grades = [
  "پیش دبستان",
  "اول",
  "دوم",
  "سوم",
  "چهارم",
  "پنجم",
  "ششم",
  "هفتم",
  "هشتم",
  "نهم",
  "دهم",
  "یازدهم",
  "دوازدهم",
];
class filter {
  productsPage = (products, options) => {
    const { grade, subject, sort } = options;

    if (grade.length > 0 || subject.length > 0 || sort) {
      localStorage.setItem("filter", "ON");
    }
    let finalSort;
    let byGradeFilter = [];
    if (grade.length > 0) {
      grade.map((item1) => {
        for (let i = 0; i < products.length; i++) {
          if (grades[products[i].gradeId] === item1) {
            byGradeFilter.push(products[i]);
          }
        }
      });
    } else {
      byGradeFilter = products;
    }
    let bySubjectFilter = [];
    if (subject.length > 0) {
      subject.map((item1) => {
        for (let i = 0; i < byGradeFilter.length; i++) {
          if (byGradeFilter[i].name === item1) {
            bySubjectFilter.push(byGradeFilter[i]);
          }
        }
      });
    } else {
      bySubjectFilter = byGradeFilter;
    }

    if (sort === "گران ترین") {
      finalSort = bySubjectFilter.sort((item1, item2) => {
        return item1.product[0].price - item2.product[0].price;
      });
    } else {
      finalSort = bySubjectFilter;
    }
  };
}

const _filter = new filter();

export default _filter;