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Function: cacheConcur()

cacheConcur<Value>(concurIterable): ConcurIterable<Value>

Returns a concur iterable equivalent to concurIterable that iterates over concurIterable at most once by lazily caching the values from the first iteration.

Type Parameters​

• Value

Parameters​

concurIterable​

ConcurIterable<Value>

Returns​

ConcurIterable<Value>

Example​

import { asConcur, eachConcur, cacheConcur, mapConcur, pipe, reduceConcur, toArray } from 'lfi'

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

const asyncIterable = pipe(
  asConcur([`sloth`, `lazy`, `sleep`]),
  mapConcur(async word => {
    const response = await fetch(`${API_URL}/${word}`)
    return (await response.json())[0].phonetic
  }),
  eachConcur(console.log),
  cacheConcur,
)
// No output

console.log(
  await pipe(
    asyncIterable,
    reduceConcur(toArray()),
  ),
)
// NOTE: This order may change between runs
//=> /slɑθ/
//=> /ˈleɪzi/
//=> /sliːp/
//=> [ '/slɑθ/', '/ˈleɪzi/', '/sliːp/' ]

console.log(
  await pipe(
    asyncIterable,
    reduceConcur(toArray()),
  ),
)
// NOTE: This order may change between runs
//=> [ '/slɑθ/', '/ˈleɪzi/', '/sliːp/' ]
Playground

Since​

v2.0.0

Defined in​

side-effects.d.ts:475