Function getRefKey

repos/effect/packages/effect/src/MutableHashMap.ts:493–503

(
  bucket: NonEmptyArray<K>,
  key: K
)

 * Use to transform an existing `MutableHashMap` value in place without
 * inserting missing keys.
 *
 * **Example** (Modifying existing values)
 *
 * ```ts import.meta.vitest
 * import { MutableHashMap, Option } from "effect"
 *
 * const map = MutableHashMap.make(["count", 5], ["total", 100])
 *
 * // Increment existing value
 * MutableHashMap.modify(map, "count", (n) => n + 1)
 * MutableHashMap.get(map, "count") // => Option.some(6)
 *
 * // Double existing value
 * MutableHashMap.modify(map, "total", (n) => n * 2)