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In the new ES6 Class syntax it is not possible to do

class Person {
    this.type = 'person';

But if I define the property inside the contructor it works:

class Person {
    constructor(name) { //class constructor
        this.name = name;
        this.type = 'person';
    }

I know the possibility to have properties outside methods is being discussed but as of today and what relates to the ES6 specs it is not possible.

Is my solution a correct way to define static properties for the Class (for semantic reasons I defined those properties inside the constructor but it seems to work inside other methods)? Is there a better way?

I was looking at the spec in Method Defenition and found no information about this.

In the new ES6 Class syntax it is not possible to do

class Person {
    this.type = 'person';

But if I define the property inside the contructor it works:

class Person {
    constructor(name) { //class constructor
        this.name = name;
        this.type = 'person';
    }

I know the possibility to have properties outside methods is being discussed but as of today and what relates to the ES6 specs it is not possible.

Is my solution a correct way to define static properties for the Class (for semantic reasons I defined those properties inside the constructor but it seems to work inside other methods)? Is there a better way?

I was looking at the spec in Method Defenition and found no information about this.

• javascript
• ecmascript-6

Share Improve this question Follow asked Jan 25, 2016 at 20:24 RikardRikard 7,8051313 gold badges6060 silver badges9999 bronze badges 3

• Depends on how you want to access them. That implementation gives each instance a member named type but if you wanted statics more like how C# does them then you'd do something like Person.type = 'person'. Then it would only be attached to the class instead of the individual instances. – Mike Cluck Commented Jan 25, 2016 at 20:26
• @MikeC there are many usecases for such properties, I didn't have a specific in mind. If we extend it we can still use/change that property. My question in more in lines like: is this ok to do?, or is there a more correct way? that can be done from inside the Class. – Rikard Commented Jan 25, 2016 at 20:34
• 3 Then I'd say, yes, that's pletely fine. Although I wouldn't call those "static properties". They're "instance properties" or just properties. – Mike Cluck Commented Jan 25, 2016 at 20:37

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2 Answers 2

Sorted by: Reset to default 10

You can create static getter:

"use strict";

class Person {
  static get type() {
    return 'person'
  }
}

console.log(Person.type) // 'person'

As already said, what you are doing is creating an instance property. Adding such properties in the constructor is what the constructor is there for. This hasn't changed with ES6.

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