import { Betterator, AsyncBetterator } from 'betterator'

const slothActivities = [`sleeping`, `eating`, `climbing`]

// Or `new Betterator(slothActivities[Symbol.iterator]())`
const iterator = Betterator.fromIterable(slothActivities)

while (iterator.hasNext()) {
  console.log(iterator.getNext())
}
//=> sleeping
//=> eating
//=> climbing

try {
  iterator.getNext()
} catch (e) {
  console.log(e.message)
}
//=> Doesn't have next

console.log(iterator.getNextOr(() => `being lazy`))
//=> being lazy

const asyncSlothActivities = (async function* () {
  yield* slothActivities
})()

// Or `new AsyncBetterator(slothActivities[Symbol.asyncIterator]())`
const asyncIterator = AsyncBetterator.fromAsyncIterable(asyncSlothActivities)

while (await asyncIterator.hasNext()) {
  console.log(await asyncIterator.getNext())
}
//=> sleeping
//=> eating
//=> climbing

try {
  await asyncIterator.getNext()
} catch (e) {
  console.log(e.message)
}
//=> Doesn't have next

const delay = timeout => new Promise(resolve => setTimeout(resolve, timeout))
console.log(
  await asyncIterator.getNextOr(() => delay(10).then(() => `being lazy`)),
)
//=> being lazy