Rebuild object methods obtained from localStorage

Utilizing JSON.stringify and JSON.parse to save and retrieve objects from localStorage has led to a discovery - JSON.stringify seems to remove the instance functions from the object. This means that once I use JSON.parse, I lose the ability to execute myObject.doSomething(). While I can manually attach this function like so: 

myObject.doSomething = MyClass.prototype.myFunction
, this could become tedious if repeated often in the web app. How do developers typically handle this scenario in JavaScript?

javascriptjsonlocal-storage

Answer №1

When dealing with JSON data, it is important to note that functions are not stored within it, only simple typed variables. To work around this limitation, I have implemented a restore method in my class that allows me to easily re-populate the class with the necessary data from JSON.

In my code base, I have extensively utilized the Value Object (VO) design pattern with great success. However, it's worth mentioning that IE7/IE8 can pose some challenges when using this approach for cross-window communication. Specifically, IE7 may not return the correct "typeof" for certain properties, leading to complications during the restoration process.

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