Function isSubsequenceOf

packages/diff-sequences/src/__tests__/index.property.test.ts:47–59

(
  subsequence: Array<string>,
  sequence: Array<string>,
)

};

const isSubsequenceOf = (
  subsequence: Array<string>,
  sequence: Array<string>,
): boolean => {
  let iSub = 0;
  for (let iSeq = 0; iSeq !== sequence.length; iSeq += 1) {
    if (iSub !== subsequence.length && subsequence[iSub] === sequence[iSeq]) {
      iSub += 1;
    }
  }

  return iSub === subsequence.length;
};

it.prop([fc.array(char())])('should be reflexive', a => {
  expect(findCommonItems(a, a)).toEqual(a);