A better sync and async iterator API.
- Intuitive: easy to use
hasNextandgetNextmethods - Familiar: lots of other programming languages use the same API
- Tiny: ~400 bytes minzipped
- Awesome Name: you have to admit it's pretty rad 😎
$ npm i betteratorimport { 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 lazySee the type definitions for more documentation.
Stars are always welcome!
For bugs and feature requests, please create an issue.
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This is not an official Google product.