Function firstIndex

firstIndex<T>(
    arr: T[],
    predicate: (value: T, index: number, array: T[]) => boolean,
    thisArg?: any,
): Option<number>
Returns the index of the first element in the array that satisfies the provided testing function. Otherwise None is returned.
Type Parameters
- T
Parameters
- arr: T[]
  An array
- predicate: (value: T, index: number, array: T[]) => boolean
  A predicate function.
- OptionalthisArg: any
  If provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
Returns Option<number>
The index of the first item that matches the predicate, or None if no item matches.
- Defined in src/array.ts:92