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Function: uniqueByConcur()

Returns a concur iterable containing the values of concurIterable, except values for which fn returns a value awaitable to the same value are deduplicated.

When values are deduplicated, the value earlier in iteration order wins.

Example​

import { asConcur, pipe, reduceConcur, toArray, uniqueByConcur } from 'lfi'

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

console.log(
  await pipe(
    asConcur([`sloth`, `lazy`, `sleep`]),
    uniqueByConcur(async word => {
      const response = await fetch(`${API_URL}/${word}`)
      const [{ meanings }] = await response.json()
      return meanings[0].partOfSpeech
    }),
    reduceConcur(toArray()),
  ),
)
// NOTE: These words may change between runs
//=> [ 'sloth', 'sleep' ]
Playground

Since​

v0.0.2

Call Signature​

uniqueByConcur<Value>(fn): (concurIterable) => ConcurIterable<Value>

Type Parameters​

• Value

Parameters​

fn​

(value) => unknown

Returns​

Function

Parameters​

concurIterable​

ConcurIterable<Value>

Returns​

ConcurIterable<Value>

Defined in​

filters.d.ts:515

Call Signature​

uniqueByConcur<Value>(fn, concurIterable): ConcurIterable<Value>

Type Parameters​

• Value

Parameters​

fn​

(value) => unknown

concurIterable​

ConcurIterable<Value>

Returns​

ConcurIterable<Value>

Defined in​

filters.d.ts:518