TypeScript Generics: Incorporating inline constraints to ensure a value is valid for object keynames and can also be cast as a string

Is it possible to modify the signature of sortArrayItemsByDate in order to add the following additional constraints cumulatively:

  1. T must have a key named propName (with a value in object key-names)
  2. T[propName] should be a string at the same time

Here is a link to the StackBlitz playground

 const sortArrayItemsByDate = <T>(items: T[], propName: string): T[] =>
    items.sort((a: T, b: T) => Date.parse(a[propName]) - Date.parse(b[propName]));


 interface StudentModel {
    name: string;
    birthday: string;
 }

  const s0: StudentModel = {
    name: "Peter",
    birthday: "2001-11-23",
  };

  const s1: StudentModel = {
     name: "John",
     birthday: "2003-11-30",
  };

  const students: StudentModel[] = [s0, s1];
  const studentsSorted = sortArrayItemsByDate(students, 'birthday');

Answer №1

Limit T to only include objects that have string values for all keys, and specify that propName should be a key of T

const sortArrayItemsByDate = <T extends Record<keyof T,string>>(items: T[], propName: keyof T): T[] =>
    items.sort((a: T, b: T) => Date.parse(a[propName]) - Date.parse(b[propName]));

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