Collection | /src/Collection.ts | collection@v1.0.1

method Collection.prototype.findKey

import { Collection } from "https://deno.land/x/collection@v1.0.1/src/Collection.ts";

findKey(fn: (

value: V,

key: K,

collection: this,

) => boolean): K | undefined

Searches for the key of a single item where the given function returns a truthy value. This behaves like Array.findIndex(), but returns the key rather than the positional index.

findKey<T>(fn: (

this: T,

value: V,

key: K,

collection: this,

) => boolean, thisArg: T): K | undefined

Searches for the key of a single item where the given function returns a truthy value. This behaves like Array.findIndex(), but returns the key rather than the positional index.