I'm not sure why everyone is getting hung up on the fact that this is implemented with strings and a switch statement. Who cares? Use constants. If JS had enums

I'm not sure why everyone is getting hung up on the fact that this is implemented with strings and a switch statement. Who cares? Use constants. If JS had enums we would use them, but it doesn't. The point is that there are a finite, well-enumerated set of possible state changes, which are all localized in one place: the reducer. Whether you call them "DO_THING" vs. constants.actions.DO_THING (which could be an integer or whatever you want) or whether you use a switch statement vs. if block vs. dictionary lookup is entirely up to you.