Function: nextAsync()
nextAsync<
Value>(asyncIterable):Promise<[AsyncOptional<Value>,AsyncIterable<Value,any,any>]>
Returns a promise that resolves to a pair of async iterables. If
asyncIterable is empty, then both of the returned async iterables are
empty. Otherwise, the first async iterable contains the first value of
asyncIterable and the second async iterable contains the rest of the values
of asyncIterable. The second async iterable can only be iterated once.
Type Parameters
• Value
Parameters
• asyncIterable: AsyncIterable<Value, any, any>
Returns
Promise<[AsyncOptional<Value>, AsyncIterable<Value, any, any>]>
Example
const slothActivities = asAsync([`sleeping`, `yawning`, `eating`])
const [first, rest] = await nextAsync(slothActivities)
console.log(await getAsync(first))
//=> sleeping
console.log(await reduceAsync(toArray(), rest))
//=> [ 'yawning', 'eating' ]
const badThingsAboutSloths = emptyAsync
const [first2, rest2] = await nextAsync(badThingsAboutSloths)
console.log(await countAsync(first2))
//=> 0
console.log(await countAsync(rest2))
//=> 0