method Collection.prototype.lastKeyimport { Collection } from "https://deno.land/x/revoltio@v1.0.0/deps.ts"; lastKey(): K | undefinedObtains the last key(s) in this collection. lastKey(amount: number): K[]Obtains the last key(s) in this collection. ReturnsK | undefinedA single key if no amount is provided or an array of keys, starting from the start if amount is negative Parametersamount: numberReturnsK[]