decorator.errors.js

Validator.showErrors = function() {
   for(var count=0; count < this.errors.length; count++){
      console.log(this.errors[count])
   }
}

decorator.js

Validator.decorators = {
   hasName : {
      validate : function(form) {
         if (form.name) {
            console.log('The form has name.')
         } else {
            Validator.errors.push('No name!');
         }
      }
   },
   hasAge : {
      validate : function(form) {
         if (form.age) {
            console.log('The form has age.')
         } else {
            Validator.errors.push('No age!')
         }
      }
   },
   hasZipCode : {
      validate : function(form) {
         if (form.zipCode) {
            console.log('The form has zip code.')
         } else {
            Validator.errors.push('No zip code!')
         }
      }
   }
}

sample.js

Validator.decorators.hasName.validate(form);

Validator.decorators.hasAge.validate(form);

Validator.decorators.zipCode.validate(form);