Function findIndex

findIndex<T>(
xs: readonly T[],
predicate: (x: T, i: number) => boolean,
): OptionType<number>
Locate the index of the first element matching predicate, wrapped in an Option — none replaces the native -1 sentinel.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
Parameters
- xs: readonly T[]
- predicate: (x: T, i: number) => boolean
Returns OptionType<number>
Example
```
pipe(
    orders,
    Arrays.findIndex((o) => o.status === "shipped"),
  )
```
- Defined in arrays/search.ts:48
findIndex<T>(
predicate: (x: T, i: number) => boolean,
): (xs: readonly T[]) => OptionType<number>
Locate the index of the first element matching predicate, wrapped in an Option — none replaces the native -1 sentinel.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
Parameters
- predicate: (x: T, i: number) => boolean
Returns (xs: readonly T[]) => OptionType<number>
Example
```
pipe(
    orders,
    Arrays.findIndex((o) => o.status === "shipped"),
  )
```
- Defined in arrays/search.ts:52