code: function noval(value, recursive) {
    assertType(recursive, 'boolean', true, 'Invalid parameter: recursive');
  
    if (recursive === undefined) recursive = false;
  
    if (value === undefined || value === null) {
      return true;
    }
    else if (typeof value === 'string') {
      return (value === '');
    }
    else if (recursive && (value instanceof Array)) {
      let n = value.length;
  
      for (let i = 0; i < n; i++) {
        if (!noval(value[i], true)) return false;
      }
  
      return true;
    }
    else if (recursive && (typeof value === 'object') && (value.constructor === Object)) {
      for (let p in value) {
        if (!noval(value[p], true)) return false;
      }
  
      return true;
    }
    else {
      return false;
    }
  }
docs: Checks if a given value is equal to null. Option to specify recursion, which
  would further evaluate inner elements, such as when an Array or Object is
  specified.
  
  @param {*} value - Value to evaluate.
  @param {boolean} [recursive=false] - Specifies whether to recursively
  evaluate the supplied value's inner
  values (i.e. an Array or Object).
  
  @return {boolean} True if null, false otherwise.
  
  @alias module:requiem~helpers.noval