Variable findIndex`Const`

findIndex: <T>(predicate?: PredicateFunction<T>) => CollectorFunction<T, number> = firstIndex

Type declaration

- <T>(predicate?: PredicateFunction<T>): CollectorFunction<T, number>
- Returns the index of the first element in the source that satisfies the predicate.
  Type Parameters
  - T
    Type of items in the source.
  Parameters
  - predicate: PredicateFunction<T> = ...
    Predicate function to determine if an element should be returned.
  Returns CollectorFunction<T, number>
  Collector that returns the index of the first element in the source that satisfies the predicate.
  Example
```
const result = firstIndex<number>((x) => x > 1)([1, 2, 3]);
console.log(result); // 1
```