What is the best way to convert a JSON object back into an object with its own set of methods?

Currently, I have a JavaScript object with multiple methods attached via prototype.

When I serialize the object to JSON, only the property values are saved, which is expected. It wouldn't make sense to save the methods as well.

Upon deserialization of the JSON object, I end up with an object that looks similar to the original one without any associated methods.

I understand why this occurs but I'm curious if there is a common pattern for addressing this issue.

In my research, I came across a small JavaScript library called Classy classes for JS, which offers a solution like this:

var MyClass = Class.$extend({
  __init__ : function() { alert('called'); },
  toString() : function() {
    return this.value;
  })
});
var obj = MyClass.$withData({value: 42});
alert(obj.toString());

While this method works, it's challenging to apply it to a complex hierarchy of objects.

EDIT: To clarify, I am aware that Classy (and jQuery as well) can add data to a specific object to include prototyped methods. However, my main concern is how to implement this for nested objects within the hierarchy.

Answer №1

In case you're using jQuery, you have the option to utilize $.extend(obj, yourDataFromJSON);

This method will integrate all information from the second object into the first one, replacing any existing values.

Alternatively, as demonstrated in the Classy code, employing

MyClass.$withData(yourDataFromJSON);
can achieve the same result, even for nested data:

for(var key in data) {
    var value = getOwnProperty(data, key);
    if(value !== undefined) rv[key] = value;
}

This approach essentially transfers everything from data into the object, regardless of whether it's another object (in cases of nested data), an array or any non-undefined element (which is not found in JSON).

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