return object{is → boolen, count → number}
- check object has defined in array
function (v, search, val) {
  var defined = Object.create(null)
  defined.is = false
  defined.count = 0
  var length = v.length
  var i
  for (i = 0; i < length; i++) {
    if (isDefine(v[i][search])) {
      if (isDefine(val) && v[i][search] === val) {
        defined.is = true
        defined.count += 1
      }
    }
  }
  return defined
}