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Function: allAsync()

Returns a promise that resolves to true if fn returns a truthy value or a promise that resolves to a truthy value for all values of asyncIterable. Otherwise returns a promise that resolves to false.

Like Array.prototype.every, but for async iterables.

Example​

import { allAsync, asAsync, pipe } from 'lfi'

const API_URL = `https://api.dictionaryapi.dev/api/v2/entries/en`
const getPartsOfSpeech = async word => {
  const response = await fetch(`${API_URL}/${word}`)
  const [{ meanings }] = await response.json()
  return meanings.map(meaning => meaning.partOfSpeech)
}

console.log(
  await pipe(
    asAsync([`sloth`, `lazy`, `sleep`]),
    allAsync(async word => (await getPartsOfSpeech(word)).includes(`verb`)),
  ),
)
//=> true

console.log(
  await pipe(
    asAsync([`sloth`, `lazy`, `sleep`]),
    allAsync(async word => (await getPartsOfSpeech(word)).includes(`noun`)),
  ),
)
//=> false
Playground

Since​

v0.0.1

Call Signature​

allAsync<Value>(fn): (asyncIterable) => Promise<boolean>

Type Parameters​

• Value

Parameters​

fn​

(value) => unknown

Returns​

Function

Parameters​

asyncIterable​

AsyncIterable<Value, any, any>

Returns​

Promise<boolean>

Defined in​

predicates.d.ts:102

Call Signature​

allAsync<Value>(fn, asyncIterable): Promise<boolean>

Type Parameters​

• Value

Parameters​

fn​

(value) => unknown

asyncIterable​

AsyncIterable<Value, any, any>

Returns​

Promise<boolean>

Defined in​

predicates.d.ts:102