whole_func_string: function (el, check) {
    var cls = el.classList
    var size = cls.length
    var result = false
    var i = 0
    for (i; i < size; i++) {
      if (cls[i].toString() === check) result = true
    }
    return result
  }
func_code_string: function (el, check) {
    var cls = el.classList
    var size = cls.length
    var result = false
    var i = 0
    for (i; i < size; i++) {
      if (cls[i].toString() === check) result = true
    }
    return result
  }
func_documentation_string: return number
  - check element class