CFP - Docs - pAll

pAll

(predicate: AsyncPredicate) => async (collection: Collection) => boolean

One at a time, asynchronously test if all entries pass a condition

Try It

const gt2 = async n => n > 2
const allGt2 = pAll(gt2)

await allGt2([2, 3]) // is false
await allGt2([3, 4]) // is true
await allGt2({ b: 2, c: 3 }) // is false
await allGt2({ c: 3, d: 4 }) // is true
const gt2 = async (n: number) => n > 2
const allGt2 = pAll(gt2)

await allGt2([2, 3]) // is false
await allGt2([3, 4]) // is true
await allGt2({ b: 2, c: 3 }) // is false
await allGt2({ c: 3, d: 4 }) // is true

Try It

const gt2 = async n => n > 2
const allGt2 = pAll(gt2)

await allGt2([2, 3]) // is false
await allGt2([3, 4]) // is true
await allGt2({ b: 2, c: 3 }) // is false
await allGt2({ c: 3, d: 4 }) // is true
const gt2 = async (n: number) => n > 2
const allGt2 = pAll(gt2)

await allGt2([2, 3]) // is false
await allGt2([3, 4]) // is true
await allGt2({ b: 2, c: 3 }) // is false
await allGt2({ c: 3, d: 4 }) // is true

Sometimes we want to asynchronously test if all entries pass a condition. Below, we call a mock store API to see if all items in our shopping cart are in stock. If so, we should let them know of a pickup discount.

Try It

const itemsInStock = new Set(['shoes', 'broom', 'mop', 'socks', 'detergent'])

const storeApi = {
  inStock: async item => itemsInStock.has(item),
}

const allInStock = pAll(storeApi.inStock)
const shoppingCart = ['broom', 'mop', 'detergent']
const showPickupDiscount = await allInStock(shoppingCart)

console.log(showPickupDiscount) // is true
const itemsInStock = new Set(['shoes', 'broom', 'mop', 'socks', 'detergent'])

const storeApi = {
  inStock: async (item: string) => itemsInStock.has(item),
}

const allInStock = pAll(storeApi.inStock)<string[]>
const shoppingCart = ['broom', 'mop', 'detergent']
const showPickupDiscount = await allInStock(shoppingCart)

console.log(showPickupDiscount) // is true

Try It

const itemsInStock = new Set([
  'shoes',
  'broom',
  'mop',
  'socks',
  'detergent',
])

const storeApi = {
  inStock: async item => itemsInStock.has(item),
}

const allInStock = pAll(storeApi.inStock)
const shoppingCart = ['broom', 'mop', 'detergent']
const showPickupDiscount =
  await allInStock(shoppingCart)

console.log(showPickupDiscount) // is true
const itemsInStock = new Set([
  'shoes',
  'broom',
  'mop',
  'socks',
  'detergent',
])

const storeApi = {
  inStock: async (item: string) =>
    itemsInStock.has(item),
}

const allInStock = pAll(storeApi.inStock)<
  string[]
>
const shoppingCart = ['broom', 'mop', 'detergent']
const showPickupDiscount =
  await allInStock(shoppingCart)

console.log(showPickupDiscount) // is true

pAll awaits each item before moving onto the next. See async.everyLimit if you want to run more than one call at a time.

Try It

const start = new Date().getTime()

const gt2 = async n => {
  const msPassed = Date.now() - start
  console.log(`ms passed: ${msPassed}, for n = ${n}`)

  await pWaitMs(20)
  return n > 2
}
const allGt2 = pAll(gt2)

await allGt2([3, 4, 5])
const totalMsPassed = Date.now() - start
console.log(`total ms passed: ${totalMsPassed}`)
const start = new Date().getTime()

const gt2 = async (n: number) => {
  const msPassed = Date.now() - start
  console.log(`ms passed: ${msPassed}, for n = ${n}`)

  await pWaitMs(20)
  return n > 2
}
const allGt2 = pAll(gt2)<number[]>

await allGt2([3, 4, 5])
const totalMsPassed = Date.now() - start
console.log(`total ms passed: ${totalMsPassed}`)

Try It

const start = new Date().getTime()

const gt2 = async n => {
  const msPassed = Date.now() - start
  console.log(
    `ms passed: ${msPassed}, for n = ${n}`
  )

  await pWaitMs(20)
  return n > 2
}
const allGt2 = pAll(gt2)

await allGt2([3, 4, 5])
const totalMsPassed = Date.now() - start
console.log(`total ms passed: ${totalMsPassed}`)
const start = new Date().getTime()

const gt2 = async (n: number) => {
  const msPassed = Date.now() - start
  console.log(
    `ms passed: ${msPassed}, for n = ${n}`
  )

  await pWaitMs(20)
  return n > 2
}
const allGt2 = pAll(gt2)<number[]>

await allGt2([3, 4, 5])
const totalMsPassed = Date.now() - start
console.log(`total ms passed: ${totalMsPassed}`)