Intermediate Exercism • typescript

Grade School

Challenge Overview

Given students' names along with the grade they are in, create a roster for the school.

Source: Exercism typescript/grade-school

💡 View Solution

export class GradeSchool {
  private _roster: { [key: number]: string[] } = {};
  constructor() {}
  roster() { return JSON.parse(JSON.stringify(this._roster)); }
  add(name: string, grade: number) {
    for (const g in this._roster) this._roster[g] = this._roster[g].filter(n => n !== name);
    this._roster[grade] = [...(this._roster[grade] || []), name].sort();
  }
  grade(grade: number) { return [...(this._roster[grade] || [])]; }
}