Function check

modules/polaris/src/test/ts/atomic/api/ParrayFindTest.ts:9–17

(expected: Optional<string>, input: string[], value: string | null)

UnitTest.test('api.PositionArray.find', () => {
  const check = (expected: Optional<string>, input: string[], value: string | null) => {
    const pred = (unit: Parrays.PArrayTestItem) => {
      return unit.item === value;
    };

    const parray = Parrays.make(input);
    const actual = PositionArray.find(parray, pred);
    KAssert.eqOptional('eq', expected, actual.map((x) => x.item));
  };

  check(Optional.none(), [], null);
  check(Optional.some('a'), [ 'a' ], 'a');