How to understand JS object structure from Chrome console.log() output?

Question

Example:

What does does (...) indicate as a property value?

When a property has dropdown tag vs without a dropdown tag - what does this indicate?

(the following snippet uses mobx action & action.bound - though these do not influence the question at hand)

Answer 1

Please use mobx toJs function for logging into console:

var obj = mobx.observable({
    x: 1
});

var clone = mobx.toJS(obj);
console.log(clone);

further info.

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• If you are using mobx-state-tree instead of toJS use getSnapShot.