method Collection.prototype.firstKeyimport { Collection } from "https://deno.land/x/denocordts@1.2.0/deps.ts"; firstKey(): K | undefinedObtains the first key(s) in this collection. firstKey(amount: number): K[]Obtains the first key(s) in this collection. ReturnsK | undefinedA single key if no amount is provided or an array of keys, starting from the end if amount is negative Parametersamount: numberReturnsK[]