types - Search predefined instances of Typescript class

Question

This is a complement of this question

Lets say i have this class:

export class PizzaSize {
  static readonly SMALL  = new PizzaSize('SMALL', 'A small pizza');
  static readonly MEDIUM = new PizzaSize('MEDIUM', 'A medium pizza');
  static readonly LARGE  = new PizzaSize('LARGE', 'A large pizza');

  // private to disallow creating other instances of this type
  private constructor(private readonly key: string, public readonly value: any) {
  }

  toString() {
    return this.key;
  }
}

I can access the values of the properties by doing this:

console.log(PizzaSize.MEDIUM); 
console.log(PizzaSize.MEDIUM.value); 

But i need a function that i pass the value, and it returns me the corresponding instance of the class

Example:

searchInstancesOfClass('A small pizza');

I want it to return me the SMALL instance;

How can i do this?

question from:https://stackoverflow.com/questions/65944878/search-predefined-instances-of-typescript-class

Answer 1

It should be a simple matter putting all the objects that you want to search through into an array, and then searching in that array.

  static searchInstancesOfClass(value: string): PizzaSize | undefined {
    const staticPizzas = [
      this.SMALL,
      this.MEDIUM,
      this.LARGE,
    ]
    return staticPizzas.find(pizza => pizza.value === value)
  }

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