Javascript: Add property to prototype with class expression [duplicate]

Question

How to add a property to prototype with class expression. I can do it with the older method:

function Example(){}
Example.prototype.property = 'PROPERTY'

But I don't know how can I do the same thing with class expression

class is only synthetic sugar so under the hood it works as in Your example — Alcadur
– Alcadur, Commented Mar 29, 2020 at 18:58
You cannot do it inside the class body, there is no syntax for that. Only for defining methods (and getters/setters). — Bergi
– Bergi, Commented Mar 29, 2020 at 19:02
Usually, one does not set data values in the prototype unless they are read-only. If you ever set a new value for the data value in the prototype, it will affect all instances which is usually not what you want. If you ever a new value for the data value on an instance, it will "hide" and "override" the prototype value. It's way more common to just initialize a property on the object in your constructor and not put data on the prototype. — jfriend00
– jfriend00, Commented Mar 29, 2020 at 22:06
I actually wanted don't waste memory by big size properties during each instance process. The other hand, I wanted make that with class expression. But now I suppose there is no syntax for what I wish based on your answers and comments — Javad
– Javad, Commented Mar 30, 2020 at 10:32

Max Starling · Accepted Answer · 2020-03-29 18:56:10Z

2

Actually you can do it the same way :)

answered Mar 29, 2020 at 18:56

Max Starling

1,03710 silver badges9 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1