Function difference_

packages/effect-app/src/Set.ts:385–388

(E: Equivalence.Equivalence<A>)

 * Form the set difference (`x` - `y`)
 */
export function difference_<A>(E: Equivalence.Equivalence<A>): (l: Set<A>, r: Set<A>) => Set<A> {
  const elemE = elem_(E)
  return (x, y) => filter((a: A) => !elemE(y, a))(x)
}

/**
 * Form the set difference (`x` - `y`)