update mutable objects in a callback? about seamless-immutable

[rtfeldman]

I haven't come across this use case yet, but it turns out you can already do this pretty cleanly with asMutable:

var item = Immutable({name: "bob"});

// new Item is immutable, obj is mutable
var newItem = (function(obj) {
   obj.name = "henry";
   return obj;
})(item.asMutable());

[rtfeldman]

@seanhess Seems like this would address your use case, yeah? 😃

[seanhess]

Cool! But wouldn't newItem be mutable afterward?

[rtfeldman]

True! Fixed:

var item = Immutable({name: "bob"});

// new Item is immutable, obj is mutable
var newItem = (function(obj) {
   obj.name = "henry";
   return Immutable(obj);
})(item.asMutable());

[seanhess]

I still think something more terse might be a good addition to the library, but nothing I can't fix with my own function. Thanks for being awesome!

[rtfeldman]

Glad it was helpful! 😸