React tldr; Why you should use an object, and not an array, for lists in Redux

• With object solution you won't get duplicated items.
• Using an object will save your future self some time and bugs.
• CRUD operations do not iterate over all items each time.
• If you need an array of items, just add selector that will convert object to array.

Source: https://medium.com/javascript-in-plain-english/https-medium-com-javascript-in-plain-english-why-you-should-use-an-object-not-an-array-for-lists-bee4a1fbc8bd