Overwritting observable/observableArray set method

knockout.js

Solution

You can create a writable computed observable

Something like this perhaps:

// private variable
this._magic = ko.observableArray();

// property with getter and setter
this.magic= ko.computed({
    read: function(){
        return _magic();
    },
    write: function(value) {
        var formatted = reduceAndFormat(value);
        this._magic(formatted);
    }
});

Problem

I am in the situation where I want to overwrite the `set` method that knockout has on observables; and to give you an example why I want that, take the following example code: ``` this.magic = ko.observableArray(); // ... inside an Ajax request var formatted = reduceAndFormat(respone); this.magic(formatted); ``` This is repeated a couple of times, so instead I would like to move the entire body of the `reduceAndFormat` function in the `set` method of a possibly customized observable. Is there a way to do this? because outside of subscribing to observable updates didn't see much else in the documentation.

Original source