Variable: indexAsync()

const indexAsync: <Value>(asyncIterable) => AsyncIterable<[number, Value]>

Defined in: transforms.d.ts:491

Returns an async iterable equivalent to asyncIterable except each value of asyncIterable is placed in an entry containing the value's 0-based index in the iteration order followed by the value itself.

Type Parameters

Value

Value

Parameters

asyncIterable

AsyncIterable<Value>

Returns

AsyncIterable<[number, Value]>

Example

import { asAsync, indexAsync, joinAsync, mapAsync, pipe } from 'lfi'

const API_URL = `https://api.dictionaryapi.dev/api/v2/entries/en`

console.log(
  await pipe(
    asAsync([`sloth`, `lazy`, `sleep`]),
    mapAsync(async word => {
      const response = await fetch(`${API_URL}/${word}`)
      return (await response.json())[0].phonetic
    }),
    indexAsync,
    mapAsync(([index, word]) => `${index + 1}. ${word}`),
    joinAsync(`\n`),
  ),
)
//=> 1. /slɑθ/
//=> 2. /ˈleɪzi/
//=> 3. /sliːp/

Playground

Since

v2.0.0