Function assertSplitAt

repos/effect/packages/effect/test/Array.test.ts:636–645

(
        input: ReadonlyArray<number>,
        index: number,
        expectedInit: ReadonlyArray<number>,
        expectedRest: ReadonlyArray<number>
      )

      const contains = Arr.contains
      deepStrictEqual(pipe([1, 2, 3], contains(2)), true)
      deepStrictEqual(pipe([1, 2, 3], contains(0)), false)

      deepStrictEqual(pipe(new Set([1, 2, 3]), contains(2)), true)
      deepStrictEqual(pipe(new Set([1, 2, 3]), contains(0)), false)
    })

    it("dedupeWith", () => {
      const dedupe = Arr.dedupeWith(Equivalence.strictEqual<number>())
      deepStrictEqual(dedupe([]), [])
      deepStrictEqual(dedupe([-0, -0]), [-0])
      deepStrictEqual(dedupe([0, -0]), [0])
      deepStrictEqual(dedupe([1]), [1])
      deepStrictEqual(dedupe([2, 1, 2]), [2, 1])