function sortBy sortBy<T>(list: T[],keyFn: (item: T) => number | string): T[] Returns a new array sorted by the value returned from keyFn. Examples Example 1 sortBy([{ age: 30 }, { age: 20 }], (p) => p.age); // [{ age: 20 }, { age: 30 }] sortBy(["banana", "apple", "cherry"], (s) => s); // ["apple", "banana", "cherry"] Type Parameters T Parameters list: T[] keyFn: (item: T) => number | string Return Type T[]