Beginner Exercism • javascript

Grade School

Challenge Overview

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

Source: Exercism javascript/grade-school

💡 View Solution

export class GradeSchool {
  constructor() { this._roster = {}; }
  roster() { return JSON.parse(JSON.stringify(this._roster)); }
  add(name, grade) {
    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) { return [...(this._roster[grade] || [])]; }
}