Guoba Utilscounting
@guoba-ai/utils / array / counting
Function: counting()
function counting<T>(array, fn): Record<string, number>;Defined in: array.ts:343
Count occurrences of each key derived from array items.
Parameters
array
T[]
The array to count
fn
(item) => string
Function that returns a key for each item
Returns
Record<string, number>
An object mapping keys to their occurrence count
Example
counting(['a', 'b', 'a', 'c', 'b', 'a'], v => v)
// { a: 3, b: 2, c: 1 }
counting([1, 2, 3, 4], v => (v % 2 === 0 ? 'even' : 'odd'))
// { odd: 2, even: 2 }
counting([], () => 'key') // {}