Function findIndex

findIndex<T>(pred): ((list) => Option<number>)
Finds the position of element which satisfies pred in the list. If the list is infinite and the element is not found, this will hang forever.
Type Parameters
- T
Parameters
- pred: ((value) => boolean)
  The match condition of element to find.
  - - (value): boolean
    - Parameters
      value: T
      Returns boolean
Returns ((list) => Option<number>)
The found position if exists.

Examples
```
import { findIndex, fromArray } from "./list.ts";
import * as Option from "./option.ts";
import { assertEquals } from "../deps.ts";

const list = fromArray([1, 4, 2, 3, 5]);

assertEquals(findIndex((x: number) => 4 <= x)(list), Option.some(1));
assertEquals(findIndex((x: number) => 0 <= x)(list), Option.some(0));
assertEquals(findIndex((x: number) => 8 <= x)(list), Option.none());
```
- - (list): Option<number>
  - Parameters
    - list: List<T>
    Returns Option<number>
- Defined in src/list.ts:1757

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