Javascript - elegant way to check object has required properties

Question

I\'m looking for an good / elegant way to validate that a javascript object has the required properties, so far this is what I have:

var fields = [\'name\',\         


        

Answer 1

I think that you should be more concerned about what's the proper way of checking for it, rather than the most elegant. I'll drop a link to a very good post from Todd Moto regarding this: Please, take a look

In short your code should look like this:

 var validateFields = function(o, required_fields) {
  required_fields.forEach(function(field){
    if(field in o){
      if((typeof o[field] != 'undefined')){
        console.log(field + ": " + o[field]);
      }else{
        console.log(field + " exists but is undefined");
      }
    }else{
      console.log(field + " doesn't exist in object");
    }
  });
}

Note: Take care when checking it has value, many expressions in javasscript are falsy (eg. 0, false, etc.) but are valid values.