CODEWITHSUNDEEP
javascript
alessandro308
alessandro308

Reputation: 2162

It is possible in Javascript to redefine the function used to access to an object property?

When I perform some tests I need to declare an object with several properties, usually equal to a dummy function/value.

In Python there is the possibility to define, through the method __get__ the function invoked when accessing to an object property, so that the property can be computed at runtime.

There is the same possibility in Javascript or some workaround?

What I want to do is to have an Object x where x[whatever_it_is] is equal to a value defined by me.

Upvotes: 0

Views: 51

Answers (2)

tnekent
tnekent

Reputation: 69

You could use Proxies to imitate __get__ using handlers with a get trap:

var handler = {
    get:: function(obj, prop) {
        // return some value here
        if (prop === "name") 
            return "Foo"
        return obj.prop
    }
}

var proxy = new Proxy(dummyObj, handler)

console.log(proxy.name) // => Foo

Upvotes: 2

Gorr1995
Gorr1995

Reputation: 258

setters in javascript or Proxy in javascript or getters can help to solve your task.

Upvotes: 2

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