rdv with cassidoo - Interview question of the week (2022-09-19)

calculateGPA.Ts

enum Grade {
  A = 4,
  "A-" = 3.7,
  "B+" = 3.3,
  B = 3,
  "B-" = 2.7,
  "C+" = 2.3,
  C = 2,
  "C-" = 1.7,
  "D+" = 1.3,
  D = 1,
  "D-" = 0.7,
  F = 0,
}

const calculateGPA = (grades: Grade[], rounding = 1) => {
  if (!Array.isArray(grades) || !grades.length) {
    return console.error("cannot calculate gpa");
  }
  const max = grades.reduce((prev, current) => {
    return prev + +Grade[current];
  }, 0);
  return +(max / grades.length).toFixed(rounding);
};

calculateGPA([Grade.A]);
// 4

calculateGPA([Grade.F, Grade.F, Grade.F]);
// 0

calculateGPA([Grade.A, Grade["A-"], Grade["B+"], Grade.B, Grade["B-"]]);
// 3.3

calculateGPA([Grade.A, Grade["B+"], Grade.B, Grade["B-"]], 2);
// 3.25