const compareArrs = (arr1, arr2) => {
  const rtnArr = []
  for (let ar1 of arr1){
    for (let ar2 of arr2){
      if (JSON.stringify(ar1) === JSON.stringify(ar2)){
        rtnArr.push(ar1)
      }
    }
  }
  return rtnArr
}

// compare [1, 2] [3, 4] with [1, 2]
console.log(compareArrs([[1, 2], [3, 4]], [[1, 2]]))