Function findIndex

findIndex<T>(
    array: List<T> | null | undefined,
    predicate?: ListIterateeCustom<T, boolean>,
    fromIndex?: number,
): number
This method is like _.find except that it returns the index of the first element predicate returns truthy for instead of the element itself.
Type Parameters
- T
Parameters
- array: List<T> | null | undefined
  The array to search.
- Optionalpredicate: ListIterateeCustom<T, boolean>
  The function invoked per iteration.
- OptionalfromIndex: number
  The index to search from.
Returns number
Returns the index of the found element, else -1.
- Defined in node_modules/@types/lodash/common/array.d.ts:385