ImmutableTest.js

var Immutable = require( 'immutable' );

var initialData,
	updatedData,
	partialData;

initialData = {
	status: 200,
	image: {
		height: 64,
		width: 64,
		url: null
	}
};

updatedData = {
	status: 200,
	image: {
		height: 32,
		width: 64,
		url: 'https://www.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=32'
	}
};

partialData = {
	image: {
		height: 32,
		url: 'https://www.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=32',
		comment: 'Lucky shot!'
	}
}

var settings = Immutable.fromJS( initialData );
console.log( settings );

updatedSettings = settings.mergeDeep( updatedData );
console.log( updatedSettings );

partialSettings = updatedSettings.mergeDeep( partialData );
console.log( partialSettings );

console.log( updatedSettings === partialSettings );

setInSettings = settings.setIn( ['status'], 500 );
noSetSettings = settings.setIn( ['status'], 200 );
console.log( setInSettings );
console.log( setInSettings === settings );
console.log( noSetSettings );
console.log( noSetSettings === settings );

newSettings = settings.mergeDeep( { message: 'Hello, World!' } );
console.log( newSettings );

Run with node ImmutableTest.js