function findLastIndeximport { findLastIndex } from "https://dotland.deno.dev/std@0.79.0/bytes/mod.ts"; findLastIndex(source: Uint8Array, pat: Uint8Array): numberFind last index of binary pattern from a. If not found, then return -1. Parameterssource: Uint8Arraysource array pat: Uint8Arraypattern to find in source array Returnsnumber