CODEWITHSUNDEEP
javascriptnode.jsexpressbabeljs
Jose K
Jose K

Reputation: 3

ES6 Express and static methods usage questions

I'm trying to learn express and wanted to use ES6 with babel. My questions is When I use static methods for handling requests like bellow ;

class MyCtrl {

   static index (req,res) {
        res.status(200).send({data:"json data"});
    }
}

router.get('/', MyCtrl.index)

I was wondering, will this(using static methods ) be effecting performance? I do not have much knowledge of Node.js runtime but as I know using static methods so often in some language (like C#) is not a good thing.

Or is there another proper way to doing this with ES6 classes .

Upvotes: 0

Views: 78

Answers (1)

Saad
Saad

Reputation: 53839

ES6 classes aren't really some new structure, it's just some syntax sugar for JavaScript's prototypal model.

So when you do something like this:

class Animal {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  static printAllowedTypes() {
    console.log('Rabbit, Dog, Cat, Monkey');
  }

  printName() {
    console.log(`Name: ${this.name}`);
  }

  printAge() {
    console.log(`Age: ${this.age}`);
  }
}

Behind the scenes, it basically just translates to this:

function Animal(name, age) {
  this.name = name;
  this.age = age;
}

Animal.printAllowedTypes = function() {
  console.log('Rabbit, Dog, Cat, Monkey');
};

Animal.prototype.printName = function() {
  console.log(`Name: ${this.name}`);
};

Animal.prototype.printAge = function() {
  console.log(`Age: ${this.age}`);
};

So it's a convenient shorthand, but it's still just using JavaScript's prototypal stuff. So as far as your question goes, all you're doing is passing a regular function to router.get so there isn't any performance difference.

Upvotes: 2

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