keyBy

keyBy<
T,
K extends string | number | symbol,
>(
array: T[],
keySelector: (item: T) => K,
): Record<K, T>

Source: array.ts:460

Creates a lookup object from an array

Type Parameters

T — Array element type
K extends string | number | symbol — Key type

Parameters

array (T[]) — The input array
keySelector ((item: T) => K) — Function to extract the key

Returns

Record<K, T> — Object mapping keys to elements

Example

CODE

const users = [
  { id: '1', name: 'Alice' },
  { id: '2', name: 'Bob' }
]

keyBy(users, u => u.id)
// { '1': { id: '1', name: 'Alice' }, '2': { id: '2', name: 'Bob' } }