CFP - Docs - mAppendAll

mAppendAll

(appended: array) => (base: array) => base

Push the contents of one array onto another

Consider appendAll instead.
This is for the uncommon case where mutating base is required.

Try It

const arr = ['a']
const appendBC = mAppendAll(['b', 'c'])
const mutatedArr = appendBC(arr)

console.log(mutatedArr === arr) // is true
console.log(arr) // is ['a', 'b', 'c']
const arr = ['a']
const appendBC = mAppendAll(['b', 'c'])
const mutatedArr = appendBC(arr)

console.log(mutatedArr === arr) // is true
console.log(arr) // is ['a', 'b', 'c']

Try It

const arr = ['a']
const appendBC = mAppendAll(['b', 'c'])
const mutatedArr = appendBC(arr)

console.log(mutatedArr === arr) // is true
console.log(arr) // is ['a', 'b', 'c']
const arr = ['a']
const appendBC = mAppendAll(['b', 'c'])
const mutatedArr = appendBC(arr)

console.log(mutatedArr === arr) // is true
console.log(arr) // is ['a', 'b', 'c']

Sometimes we want to mutate an array by pushing values onto it. Below, our apartment is receiving a few fliers. Let's update our mailboxes with the junkmail.

Try It

const mailboxes = {
  101: ['water bill'],
  102: ['birthday card'],
  103: [],
}

const addJunkmail = mAppendAll(['pizza coupon', 'housing ad'])
const deliverJunkmail = forEach(addJunkmail)
deliverJunkmail(mailboxes)
console.log(mailboxes)
// is {
//   101: water bill, pizza coupon, housing ad
//   102: birthday card, pizza coupon, housing ad
//   103: pizza coupon, housing ad
// }
type Mailboxes = Record<number, string[]>
const mailboxes = {
  101: ['water bill'],
  102: ['birthday card'],
  103: [],
}

const addJunkmail = mAppendAll(['pizza coupon', 'housing ad'])<string[]>
const deliverJunkmail = forEach(addJunkmail)<Mailboxes>
deliverJunkmail(mailboxes)
console.log(mailboxes)
// is {
//   101: water bill, pizza coupon, housing ad
//   102: birthday card, pizza coupon, housing ad
//   103: pizza coupon, housing ad
// }

Try It

const mailboxes = {
  101: ['water bill'],
  102: ['birthday card'],
  103: [],
}

const addJunkmail = mAppendAll([
  'pizza coupon',
  'housing ad',
])
const deliverJunkmail = forEach(addJunkmail)
deliverJunkmail(mailboxes)
console.log(mailboxes)
// is {
//   101: water bill, pizza coupon, housing ad
//   102: birthday card, pizza coupon, housing ad
//   103: pizza coupon, housing ad
// }
type Mailboxes = Record<number, string[]>
const mailboxes = {
  101: ['water bill'],
  102: ['birthday card'],
  103: [],
}

const addJunkmail = mAppendAll([
  'pizza coupon',
  'housing ad',
])<string[]>
const deliverJunkmail = forEach(
  addJunkmail
)<Mailboxes>
deliverJunkmail(mailboxes)
console.log(mailboxes)
// is {
//   101: water bill, pizza coupon, housing ad
//   102: birthday card, pizza coupon, housing ad
//   103: pizza coupon, housing ad
// }