Function map_

packages/effect-app/src/Set.ts:164–176

(E: Equivalence.Equivalence<B>)

 * Projects a Set through a function
 */
export function map_<B>(E: Equivalence.Equivalence<B>): <A>(set: Set<A>, f: (x: A) => B) => Set<B> {
  const elemE = elem_(E)
  return (set, f) => {
    const r = new Set<B>()
    set.forEach((e) => {
      const v = f(e)
      if (!elemE(r, v)) {
        r.add(v)
      }
    })
    return r
  }
}

/**
 * true if all elements match predicate