计算（ImmutableJS）地图的所有项目？

Question

Counting the items contained in an object, I used to have:

Object.keys(state.posts).length

Now, I have changed my posts state into an immutablejs Map, like so:

Map({ "1": {title: "First Title"}, "2" : {title: "Second Title"} });

...but now I don't know how to count the items in the object anymore? I tried a few things like Object.keys(state.posts.get()).length and Object.keys(state.posts.entries()).length , but to no avail.

Answer 1

To get the size or length of ImmutableJS Map you can do:

state.posts.size

This is as documented on ImmutableJS Map#size

Answer 2

According to docs:

state.posts.count()

will always return proper size.