Intermediate Exercism • typescript

Allergies

Challenge Overview

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

Source: Exercism typescript/allergies

💡 View Solution

const ITEMS = [
  'eggs',
  'peanuts',
  'shellfish',
  'strawberries',
  'tomatoes',
  'chocolate',
  'pollen',
  'cats'
];
export class Allergies {
  constructor(private mask: number) {}
  public list(): string[] { return ITEMS.filter((_, i) => this.mask & (1 << i)); }
  public allergicTo(item: string): boolean { return this.list().includes(item); }
}