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@basic-streams/from-iterable

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@basic-streams/from-iterable

fromIterable operator for basic-streams

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@basic-streams/from-iterable

fromIterable<T>(
  iterable: Iterable<T>,
  interval?: number,
  scheduler?: (time: number) => Stream<void>
): Stream<T>

Transforms an iterable into a stream.

import fromIterable from "@basic-streams/from-iterable"

fromIterable([1, 2, 3])(x => {
  console.log(x)
})

// > 1
// > 2
// > 3

If an interval is provided the events will be spread in time by that ammount of milliseconds, with the first one delayed. If the interval is 0 the events will be produced as soon as possible but still asynchronously.

import fromIterable from "@basic-streams/from-iterable"

fromIterable([1, 2, 3], 5000)(x => {
  console.log(x)
})

// > 1
// > 2
// > 3

// ____1____2____3

Note that the iterable is consumed lazily, meaning that next() is called only when value is needed.

import fromIterable from "@basic-streams/from-iterable"

function* generator() {
  const startTime = Date.now()
  yield Date.now() - startTime
  yield Date.now() - startTime
  yield Date.now() - startTime
}
fromIterable(generator(), 5000)(x => {
  console.log(x)
})

// > 0
// > 5000
// > 10000

//     0   5000  10000
// ____.____.____.

You can provide a custom scheduler, a function that creates a stream producing an event after the given time. By default later is used as a scheduler.

import fromIterable from "@basic-streams/from-iterable"
import later from "@basic-streams/later"

function scheduler(time) {
  return later(time / 2)
}
fromIterable([1, 2, 3], 6000, scheduler)(x => {
  console.log(x)
})

// > 1
// > 2
// > 3

// __1__2__3

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Package last updated on 28 Jun 2018

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