[redux] Create sagas to handle resolve/reject actions

[diegohaz]

[redux] Create sagas to handle resolve/reject actions

[diegohaz]

This snippet runs split(), reverse(), reverse() and join() for every action dispatched on the store (take('*')). I'm not sure how this affects performance though.

const { type, resolve, reject, ...rest } = yield take('*')
let [ suffix, ...prefix ] = type.split('_').reverse()
prefix = prefix.reverse().join('_')
// given SOME_ACTION_REQUEST, prefix = SOME_ACTION, suffix = REQUEST

Just to illustrate how wonderful generators are:

function* generator () {
  const number = yield 'foo'
  const sum = 2 + number
  yield sum
}

const gen = generator()

function* generator () {
  const number = yield 'foo'
                           ^ starts here
  const sum = 2 + number
  yield sum
}

expect(gen.next().value).toEqual('foo')

function* generator () {
  const number = yield 'foo'
                 ^---------- pauses here and returns 'foo'
  const sum = 2 + number
  yield sum
}

expect(gen.next(4).value).toEqual(6)

function* generator () {
  const number = yield 'foo'
        ^------------------- passes back 4 to number
  const sum = 2 + number
  yield sum
  ^------------------------- runs until it finds another yield, then returns the value (6)
}