import { Vector } from "https://deno.land/x/collections@0.12.1/vector.ts";
Returns the index of the last value in the vector that satisfies the provided testing function or -1 if it is not found. Optionally, you can search a subset of the vector by providing an index range. The start and end represent the index of values in the vector. The end is exclusive meaning it will not be included. If the index value is negative, it will be subtracted from the end of the vector.