Function uniqBy

uniqBy<T, U>(array: T[], keyFn: (item: T) => U): T[]

Returns a new array with unique items based on a key function.

Example:

const array = [
 { id: 1, name: "Alice" },
 { id: 2, name: "Bob" },
 { id: 1, name: "Alice" },
 { id: 3, name: "Charlie" },
 { id: 2, name: "Bob" },
];
const uniqueById = uniqBy(array, (item) => item.id);
console.log(uniqueById);
// Output: [
//   { id: 1, name: "Alice" },
//   { id: 2, name: "Bob" },
//   { id: 3, name: "Charlie" },
// ]

Type Parameters

T
U

Parameters

array: T[]
The input array.
keyFn: (item: T) => U
A function that takes an item and returns a key.

Returns T[]

A new array with unique items.