Finished the full stack apollo tutorial

• Learnt about how you it possible to use the apollo cache as a state management tool by making use of Reactive Variables via the makeVar function. You can define reactive varibles client side like so

// Initializes to true if localStorage includes a 'token' key,
// false otherwise
export const isLoggedInVar = makeVar<boolean>(!!localStorage.getItem('token'));

// Initializes to an empty array
export const cartItemsVar = makeVar<string[]>([]);

This can be acessed in Mutation hooks via any of the callback functions simply by calling the name of the reactive var as a function e.g isLoggedInVar()

Need to play around with cache.modify in more detail. This can let us modify the apollo cache in any way.