Interface ReduceCallback<V, K, T>

Reducer callback used by iterator helpers.

Example

const sum: ReduceCallback<number, number, number> = (total, value) =>
  total + value;

Type Parameters

V
Iterated value type.
K
Iterated key type.
T
Accumulator type.

ReduceCallback(pre: T, v: V, k: K, i: number, length: number): T
Reduces one iterated value into the accumulator.
Parameters
- pre: T
  Previous accumulator value.
- v: V
  Current value.
- k: K
  Current key.
- i: number
  Zero-based iteration index.
- length: number
  Total number of values in the traversal.
Returns T
Next accumulator value.
- Defined in type/index.ts:261