task solution

src/sortStudents.ts

@@ -1,16 +1,64 @@
-
 export interface Student {
   // describe Student interface
+  name: string;
+  surname: string;
+  age: number;
+  married: boolean;
+  grades: number[];
 }
 
 export enum SortType {
   // describe SortType enum
+  Name = 'name',
+  Surname = 'surname',
+  Age = 'age',
+  Married = 'married',
+  AverageGrade = 'grades',
 }
 
 // create SortOrder type
-export type SortOrder;
+export type SortOrder = 'asc' | 'desc';
+
+export function sortStudents(
+  students: Student[],
+  sortBy: SortType,
+  order: SortOrder,
+): Student[] {
+  const sortedStudents = [...students];
+
+  function getAverageGrades(student: Student): number {
+    return (
+      student.grades.reduce((sum, grade) => sum + grade, 0)
+        / student.grades.length
+    );
+  }
+
+  switch (sortBy) {
+    case SortType.Surname:
+    case SortType.Name:
+      sortedStudents.sort((a, b) => {
+        return order === 'asc'
+          ? a[sortBy].localeCompare(b[sortBy])
+          : b[sortBy].localeCompare(a[sortBy]);
+      });
+      break;
+
+    case SortType.AverageGrade:
+      sortedStudents.sort((a, b) => {
+        return order === 'asc'
+          ? getAverageGrades(a) - getAverageGrades(b)
+          : getAverageGrades(b) - getAverageGrades(a);
+      });
+      break;
 
+    default:
+      sortedStudents.sort((a, b) => {
+        return order === 'asc'
+          ? +a[sortBy] - +b[sortBy]
+          : +b[sortBy] - +a[sortBy];
+      });
+      break;
+  }
 
-export function sortStudents(students, sortBy, order) {
-  // write your function
+  return sortedStudents;
 }