How do you clear an immutable.js map back to its defaults - redux

Question

I have an immutable.js map. For example:
// default, when user first gets on page
var myObject = Immutable.Map({
productID: '',
colors: ['brown', 'red'],
sku: ''
sizes: [10]
})
Now, depending on how they get to my app - I populate that above "myObject" with different data.
so, for example: lets say they come from pathA
// pathA passes in some data... hydrate the myObject
var myObject = Immutable.Map({
productID: '090ABl',
colors: ['brown', 'red', 'yellow'],
sku: '__whatever'
sizes: [10, 18, 9]
})
so, for example: lets say they come from pathB
** this is where the issue comes from. I have that previous "state" of myObject hanging around. I need to "clear and go back to the initial state". I am using redux.
// pathB passes in some data... hydrate the myObject
var myObject = Immutable.Map({
productID: '090XZLG',
colors: ['red', 'yellow'],
sku: '__food'
sizes: [9]
})
The data is combing etc.. I need it to "clear out.". Curious if there is an Immutable.js method that enables to refresh the myObject with a new one, that is the same as the initial state. I am new to immutable.js so I am a bit curious about why its so hard to do simple things :-)

Answer 1

When using immutable for the state object in redux, in many of my reducers I set a certain key to what I get from the initial state.
i.e.:
function reeducer(state = initialState, action) {
switch (action.type) {
...
case CLEAR_SELECTION:
return state.set('selected', initialState.get('selected'));
...
}
}
And of course to make it a bit cleaner (specially to avoid repeating a string) one could create a function for this:
function resetKey(state, initialState, key) {
return state.set(key, initialState.get(key));
}
(Alternatively it could be called copyKey or copySection)
Or it could be a resetPath/copyPath
function resetPath(state, initialState, path) {
return state.setIn(key, initialState.getIn(path));
}

Answer 2

The immutable.js object does not 'know' what its 'defaults' are, so there is no way of resetting it. If you have a default object in your application just keep a reference to that in a variable, like you would if it were a plain JavaScript object:
var defaultObject = Immutable.Map({
productID: '',
colors: ['brown', 'red'],
sku: ''
sizes: [10]
})
Then when the user arrives at a certain path, you simply make your modifications and keep them in a different variable:
var myObject = defaultObject.set(...);